diff --git a/js/src/jit/AtomicOperations.h b/js/src/jit/AtomicOperations.h
index 0486cba..0f45ac8 100644
--- a/js/src/jit/AtomicOperations.h
+++ b/js/src/jit/AtomicOperations.h
@@ -391,7 +391,8 @@ inline bool AtomicOperations::isLockfreeJS(int32_t size) {
 #elif defined(__ppc__) || defined(__PPC__) || defined(__sparc__) ||     \
     defined(__ppc64__) || defined(__PPC64__) || defined(__ppc64le__) || \
     defined(__PPC64LE__) || defined(__alpha__) || defined(__hppa__) ||  \
-    defined(__sh__) || defined(__s390__) || defined(__s390x__)
+    defined(__ia64__) || defined(__sh__) || defined(__s390__) || \
+    defined(__s390x__)
 #  include "jit/shared/AtomicOperations-feeling-lucky.h"
 #else
 #  error "No AtomicOperations support provided for this platform"