diff --git a/js/src/jit/AsmJS.cpp b/js/src/jit/AsmJS.cpp
index 266fc85028e..7e013d95ca0 100644
--- a/js/src/jit/AsmJS.cpp
+++ b/js/src/jit/AsmJS.cpp
@@ -1276,6 +1276,8 @@ class MOZ_STACK_CLASS ModuleCompiler
     }
 
     bool failName(ParseNode *pn, const char *fmt, PropertyName *name) {
+        // This function is invoked without the caller properly rooting its locals.
+        gc::AutoSuppressGC suppress(cx_);
         JSAutoByteString bytes;
         if (AtomToPrintableString(cx_, name, &bytes))
             failf(pn, fmt, bytes.ptr());