diff --git a/js/src/jit/Ion.cpp b/js/src/jit/Ion.cpp
index 5b5d6790796..fd7fa07972f 100644
--- a/js/src/jit/Ion.cpp
+++ b/js/src/jit/Ion.cpp
@@ -1716,12 +1716,13 @@ IonCompile(JSContext *cx, JSScript *script,
     if (recompile) {
         JS_ASSERT(executionMode == SequentialExecution);
         builderScript->ionScript()->setRecompiling();
-    } else {
-        SetIonScript(builder->script(), executionMode, ION_COMPILING_SCRIPT);
     }
 
     // If possible, compile the script off thread.
     if (OffThreadCompilationAvailable(cx)) {
+        if (!recompile)
+            SetIonScript(builder->script(), executionMode, ION_COMPILING_SCRIPT);
+
         if (!StartOffThreadIonCompile(cx, builder)) {
             IonSpew(IonSpew_Abort, "Unable to start off-thread ion compilation.");
             return AbortReason_Alloc;