diff --git a/sjsonnet/src/sjsonnet/ValVisitor.scala b/sjsonnet/src/sjsonnet/ValVisitor.scala
index 5eec3901..33eda06c 100644
--- a/sjsonnet/src/sjsonnet/ValVisitor.scala
+++ b/sjsonnet/src/sjsonnet/ValVisitor.scala
@@ -46,7 +46,10 @@ class ValVisitor(pos: Position) extends JsVisitor[Val, Val] { self =>
       pos,
       if (decIndex != -1 || expIndex != -1) s.toString.toDouble
       else if (s.length() == 2 && s.charAt(0) == '-' && s.charAt(1) == '0') -0.0
-      else upickle.core.ParseUtils.parseIntegralNum(s, decIndex, expIndex, index).toDouble
+      else {
+        try upickle.core.ParseUtils.parseIntegralNum(s, decIndex, expIndex, index).toDouble
+        catch { case _: NumberFormatException => s.toString.toDouble }
+      }
     )
 
   def visitString(s: CharSequence, index: Int): Val = Val.Str(pos, s.toString)
diff --git a/sjsonnet/test/resources/new_test_suite/parsejson_large_integer.jsonnet b/sjsonnet/test/resources/new_test_suite/parsejson_large_integer.jsonnet
new file mode 100644
index 00000000..07912a29
--- /dev/null
+++ b/sjsonnet/test/resources/new_test_suite/parsejson_large_integer.jsonnet
@@ -0,0 +1,12 @@
+// Regression test: std.parseJson must handle integers outside Java long range.
+// Verified against cpp-jsonnet 0.21.0, go-jsonnet 0.22.0, jrsonnet 0.5.0-pre99.
+// These used to crash with NumberFormatException; now they parse as float64.
+std.parseJson("9223372036854775808") > 0 &&
+std.parseJson("-9223372036854775809") < 0 &&
+std.parseJson("99999999999999999999999999999999") > 0 &&
+// Normal integers still work
+std.parseJson("42") == 42 &&
+std.parseJson("-1") == -1 &&
+std.parseJson("0") == 0 &&
+std.parseJson("-0") == 0 &&
+true
diff --git a/sjsonnet/test/resources/new_test_suite/parsejson_large_integer.jsonnet.golden b/sjsonnet/test/resources/new_test_suite/parsejson_large_integer.jsonnet.golden
new file mode 100644
index 00000000..27ba77dd
--- /dev/null
+++ b/sjsonnet/test/resources/new_test_suite/parsejson_large_integer.jsonnet.golden
@@ -0,0 +1 @@
+true