diff --git a/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageInfoPair.java b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageInfoPair.java
index 91c1dc6eb..3f41f0b6b 100644
--- a/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageInfoPair.java
+++ b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageInfoPair.java
@@ -5,7 +5,6 @@
 
 import static java.math.RoundingMode.HALF_EVEN;
 
-import dev.ionfusion.fusion._private.HtmlWriter;
 import java.io.IOException;
 import java.math.BigDecimal;
 
diff --git a/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageReportWriter.java b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageReportWriter.java
index 22ebff5ab..c95f390d4 100644
--- a/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageReportWriter.java
+++ b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/CoverageReportWriter.java
@@ -14,8 +14,7 @@
 import com.amazon.ion.SpanProvider;
 import com.amazon.ion.Timestamp;
 import com.amazon.ion.system.IonReaderBuilder;
-import dev.ionfusion.fusion._private.HtmlWriter;
-import dev.ionfusion.fusion._private.StreamWriter;
+import dev.ionfusion.runtime._private.io.StreamWriter;
 import dev.ionfusion.runtime.base.ModuleIdentity;
 import dev.ionfusion.runtime.base.SourceLocation;
 import java.io.IOException;
diff --git a/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/EstimatedCoverageInfoPair.java b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/EstimatedCoverageInfoPair.java
index dc90e57cf..a06a5ccc8 100644
--- a/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/EstimatedCoverageInfoPair.java
+++ b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/EstimatedCoverageInfoPair.java
@@ -3,7 +3,6 @@
 
 package dev.ionfusion.fusioncli.cover;
 
-import dev.ionfusion.fusion._private.HtmlWriter;
 import java.io.IOException;
 
 class EstimatedCoverageInfoPair
diff --git a/runtime/src/main/java/dev/ionfusion/fusion/_private/HtmlWriter.java b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/HtmlWriter.java
similarity index 98%
rename from runtime/src/main/java/dev/ionfusion/fusion/_private/HtmlWriter.java
rename to fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/HtmlWriter.java
index 9c833125f..c42ab1b97 100644
--- a/runtime/src/main/java/dev/ionfusion/fusion/_private/HtmlWriter.java
+++ b/fusioncli/src/main/java/dev/ionfusion/fusioncli/cover/HtmlWriter.java
@@ -1,8 +1,9 @@
 // Copyright Ion Fusion contributors. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-package dev.ionfusion.fusion._private;
+package dev.ionfusion.fusioncli.cover;
 
+import dev.ionfusion.runtime._private.io.StreamWriter;
 import dev.ionfusion.runtime.base.ModuleIdentity;
 import java.io.IOException;
 
diff --git a/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/SiteBuilder.java b/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/SiteBuilder.java
index e2cda46c5..ba8be91f0 100644
--- a/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/SiteBuilder.java
+++ b/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/SiteBuilder.java
@@ -5,12 +5,12 @@
 
 import static java.nio.file.Files.isDirectory;
 
-import dev.ionfusion.fusion._private.StreamWriter;
 import dev.ionfusion.fusioncli.doc.site.FileCopyTemplate;
 import dev.ionfusion.fusioncli.doc.site.Site;
 import dev.ionfusion.fusioncli.doc.site.Template;
 import dev.ionfusion.fusioncli.doc.tool.layout.StreamingTemplate;
 import dev.ionfusion.fusioncli.doc.tool.mustache.MustacheTemplate;
+import dev.ionfusion.runtime._private.io.StreamWriter;
 import dev.ionfusion.runtime.base.FusionException;
 import dev.ionfusion.runtime.base.ModuleIdentity;
 import dev.ionfusion.runtime.embed.TopLevel;
diff --git a/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/layout/StreamingTemplate.java b/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/layout/StreamingTemplate.java
index 262a07d21..9cc845889 100644
--- a/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/layout/StreamingTemplate.java
+++ b/fusioncli/src/main/java/dev/ionfusion/fusioncli/doc/tool/layout/StreamingTemplate.java
@@ -3,10 +3,10 @@
 
 package dev.ionfusion.fusioncli.doc.tool.layout;
 
-import dev.ionfusion.fusion._private.StreamWriter;
 import dev.ionfusion.fusioncli.doc.site.Artifact;
 import dev.ionfusion.fusioncli.doc.site.Generator;
 import dev.ionfusion.fusioncli.doc.site.Template;
+import dev.ionfusion.runtime._private.io.StreamWriter;
 import java.nio.file.Path;
 
 /**
diff --git a/runtime/src/main/java/dev/ionfusion/fusion/FusionSymbol.java b/runtime/src/main/java/dev/ionfusion/fusion/FusionSymbol.java
index 8902c7000..e99a741ec 100644
--- a/runtime/src/main/java/dev/ionfusion/fusion/FusionSymbol.java
+++ b/runtime/src/main/java/dev/ionfusion/fusion/FusionSymbol.java
@@ -16,7 +16,7 @@
 import com.amazon.ion.ValueFactory;
 import com.amazon.ion.util.IonTextUtils;
 import dev.ionfusion.fusion.FusionBool.BaseBool;
-import dev.ionfusion.fusion._private.InternMap;
+import dev.ionfusion.runtime._private.util.InternMap;
 import dev.ionfusion.runtime.base.FusionException;
 import dev.ionfusion.runtime.base.SourceLocation;
 import dev.ionfusion.runtime.embed.TopLevel;
diff --git a/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageCollectorFactory.java b/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageCollectorFactory.java
index 8a2e73e3c..29e60ac86 100644
--- a/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageCollectorFactory.java
+++ b/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageCollectorFactory.java
@@ -6,7 +6,7 @@
 import static java.nio.file.Files.createDirectories;
 import static java.nio.file.Files.isDirectory;
 
-import dev.ionfusion.fusion._private.InternMap;
+import dev.ionfusion.runtime._private.util.InternMap;
 import java.io.IOException;
 import java.io.UncheckedIOException;
 import java.nio.file.Path;
diff --git a/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageSession.java b/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageSession.java
index f11c55692..b2637b004 100644
--- a/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageSession.java
+++ b/runtime/src/main/java/dev/ionfusion/runtime/_private/cover/CoverageSession.java
@@ -7,8 +7,8 @@
 import static java.nio.file.Files.createTempFile;
 
 import dev.ionfusion.fusion._Private_CoverageCollector;
-import dev.ionfusion.fusion._private.InternMap;
 import dev.ionfusion.runtime._private.util.Flusher;
+import dev.ionfusion.runtime._private.util.InternMap;
 import dev.ionfusion.runtime.base.SourceLocation;
 import java.io.File;
 import java.io.IOException;
diff --git a/runtime/src/main/java/dev/ionfusion/fusion/_private/StreamWriter.java b/runtime/src/main/java/dev/ionfusion/runtime/_private/io/StreamWriter.java
similarity index 97%
rename from runtime/src/main/java/dev/ionfusion/fusion/_private/StreamWriter.java
rename to runtime/src/main/java/dev/ionfusion/runtime/_private/io/StreamWriter.java
index d6c4dd171..22758b44f 100644
--- a/runtime/src/main/java/dev/ionfusion/fusion/_private/StreamWriter.java
+++ b/runtime/src/main/java/dev/ionfusion/runtime/_private/io/StreamWriter.java
@@ -1,7 +1,7 @@
 // Copyright Ion Fusion contributors. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-package dev.ionfusion.fusion._private;
+package dev.ionfusion.runtime._private.io;
 
 import static com.amazon.ion.system.IonTextWriterBuilder.UTF8;
 
diff --git a/runtime/src/main/java/dev/ionfusion/fusion/_private/InternMap.java b/runtime/src/main/java/dev/ionfusion/runtime/_private/util/InternMap.java
similarity index 98%
rename from runtime/src/main/java/dev/ionfusion/fusion/_private/InternMap.java
rename to runtime/src/main/java/dev/ionfusion/runtime/_private/util/InternMap.java
index 308af257f..75ef9a7d9 100644
--- a/runtime/src/main/java/dev/ionfusion/fusion/_private/InternMap.java
+++ b/runtime/src/main/java/dev/ionfusion/runtime/_private/util/InternMap.java
@@ -1,7 +1,7 @@
 // Copyright Ion Fusion contributors. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-package dev.ionfusion.fusion._private;
+package dev.ionfusion.runtime._private.util;
 
 import static java.util.Objects.requireNonNull;
 
diff --git a/runtime/src/test/java/dev/ionfusion/fusion/_private/InternMapTest.java b/runtime/src/test/java/dev/ionfusion/runtime/_private/util/InternMapTest.java
similarity index 99%
rename from runtime/src/test/java/dev/ionfusion/fusion/_private/InternMapTest.java
rename to runtime/src/test/java/dev/ionfusion/runtime/_private/util/InternMapTest.java
index e89a8aaae..e2419ef3b 100644
--- a/runtime/src/test/java/dev/ionfusion/fusion/_private/InternMapTest.java
+++ b/runtime/src/test/java/dev/ionfusion/runtime/_private/util/InternMapTest.java
@@ -1,7 +1,7 @@
 // Copyright Ion Fusion contributors. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-package dev.ionfusion.fusion._private;
+package dev.ionfusion.runtime._private.util;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotSame;
diff --git a/runtime/src/test/java/dev/ionfusion/fusion/_private/InternedString.java b/runtime/src/test/java/dev/ionfusion/runtime/_private/util/InternedString.java
similarity index 93%
rename from runtime/src/test/java/dev/ionfusion/fusion/_private/InternedString.java
rename to runtime/src/test/java/dev/ionfusion/runtime/_private/util/InternedString.java
index 7460f800a..44431ef22 100644
--- a/runtime/src/test/java/dev/ionfusion/fusion/_private/InternedString.java
+++ b/runtime/src/test/java/dev/ionfusion/runtime/_private/util/InternedString.java
@@ -1,7 +1,7 @@
 // Copyright Ion Fusion contributors. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-package dev.ionfusion.fusion._private;
+package dev.ionfusion.runtime._private.util;
 
 import java.util.Objects;