diff --git a/js/src/ion/IonFrames.cpp b/js/src/ion/IonFrames.cpp
index 5e2a30b79da..e19877a5bbd 100644
--- a/js/src/ion/IonFrames.cpp
+++ b/js/src/ion/IonFrames.cpp
@@ -1049,6 +1049,15 @@ GetPcScript(JSContext *cx, JSScript **scriptRes, jsbytecode **pcRes)
     // Recover the return address.
     IonFrameIterator it(rt->mainThread.ionTop);
 
+    // If the previous frame is a rectifier frame (maybe unwound),
+    // skip past it.
+    if (it.prevType() == IonFrame_Rectifier || it.prevType() == IonFrame_Unwound_Rectifier) {
+        ++it;
+        JS_ASSERT(it.prevType() == IonFrame_BaselineStub ||
+                  it.prevType() == IonFrame_BaselineJS ||
+                  it.prevType() == IonFrame_OptimizedJS);
+    }
+
     // If the previous frame is a stub frame, skip the exit frame so that
     // returnAddress below gets the return address into the BaselineJS
     // frame.