diff --git a/src/NSchema.Postgres/NSchema.Postgres.csproj b/src/NSchema.Postgres/NSchema.Postgres.csproj
index 339ed5d..c8ed1c2 100644
--- a/src/NSchema.Postgres/NSchema.Postgres.csproj
+++ b/src/NSchema.Postgres/NSchema.Postgres.csproj
@@ -20,7 +20,7 @@
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <Version>5.0.0-alpha.6</Version>
+    <Version>5.0.0-alpha.7</Version>
     <AssemblyVersion>$(Version.Split('-')[0])</AssemblyVersion>
     <FileVersion>$(Version.Split('-')[0])</FileVersion>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
diff --git a/src/NSchema.Postgres/Sql/PostgresDatabaseIntrospector.cs b/src/NSchema.Postgres/Sql/PostgresDatabaseIntrospector.cs
index 2ca17c8..6640369 100644
--- a/src/NSchema.Postgres/Sql/PostgresDatabaseIntrospector.cs
+++ b/src/NSchema.Postgres/Sql/PostgresDatabaseIntrospector.cs
@@ -1831,8 +1831,9 @@ private static SqlType MapSqlType(string dataType, string udtName, string? udtSc
             "uuid" => SqlType.Guid,
             "bytea" => SqlType.VarBinary(),
             // A user-defined type (enum, composite, …): preserve its schema so the type round-trips, collapsing
-            // the default schema the same way a domain does.
-            _ => udtSchema is null or "public" ? SqlType.Custom(udtName) : SqlType.Custom(udtSchema, udtName),
+            // the default schema the same way a domain does. Built-ins outside the switch (jsonb, inet, …)
+            // also land here with udt_schema = pg_catalog, so collapse that too.
+            _ => udtSchema is null or "public" or "pg_catalog" ? SqlType.Custom(udtName) : SqlType.Custom(udtSchema, udtName),
         };
     }
 
diff --git a/tests/NSchema.Postgres.Tests/Sql/PostgresDatabaseIntrospectorTests.cs b/tests/NSchema.Postgres.Tests/Sql/PostgresDatabaseIntrospectorTests.cs
index 68811f2..5bfd766 100644
--- a/tests/NSchema.Postgres.Tests/Sql/PostgresDatabaseIntrospectorTests.cs
+++ b/tests/NSchema.Postgres.Tests/Sql/PostgresDatabaseIntrospectorTests.cs
@@ -820,6 +820,21 @@ await Exec($"""
         column.Type.ShouldBe(SqlType.Custom(_schema, "order_status"));
     }
 
+    [Fact]
+    public async Task GetDatabase_BuiltInFallthroughColumn_MappedUnqualified()
+    {
+        // Arrange — jsonb also hits MapSqlType's fall-through, but its pg_catalog udt_schema
+        // must collapse so the type reads as declared.
+        await Exec($"""CREATE TABLE "{_schema}".events (payload jsonb NOT NULL);""");
+
+        // Act
+        var column = (await Introspect(_schema))
+            .Schemas[0].Tables.ShouldHaveSingleItem().Columns.ShouldHaveSingleItem();
+
+        // Assert
+        column.Type.ShouldBe(SqlType.Custom("jsonb"));
+    }
+
     // ── Sequences ─────────────────────────────────────────────────────────────
 
     [Fact]