diff --git a/llvm/lib/Target/Sparc/SparcISelLowering.cpp b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
index 5421aef7f579..5e0fe6747070 100644
--- a/llvm/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
@@ -1620,7 +1620,7 @@ SparcTargetLowering::SparcTargetLowering(const TargetMachine &TM,
   if (Subtarget->isV9())
     setMaxAtomicSizeInBitsSupported(64);
   else if (Subtarget->hasLeonCasa())
-    setMaxAtomicSizeInBitsSupported(64);
+    setMaxAtomicSizeInBitsSupported(32);
   else
     setMaxAtomicSizeInBitsSupported(0);