diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 95334e0..6a251bd 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -3536,6 +3536,7 @@ public:
     // ARM has atomics up to 8 bytes
     // FIXME: Set MaxAtomicInlineWidth if we have the feature v6e
     MaxAtomicPromoteWidth = 64;
+    MaxAtomicInlineWidth = 64;
 
     // Do force alignment of members that follow zero length bitfields.  If
     // the alignment of the zero-length bitfield is greater than the member