diff --git a/llvm/lib/Transforms/Scalar/Reassociate.cpp b/llvm/lib/Transforms/Scalar/Reassociate.cpp
index bec91dbe67ca..3e2d38f76bae 100644
--- a/llvm/lib/Transforms/Scalar/Reassociate.cpp
+++ b/llvm/lib/Transforms/Scalar/Reassociate.cpp
@@ -404,7 +404,7 @@ static bool ShouldBreakUpSubtract(Instruction *Sub) {
       isReassociableOp(Sub->getOperand(0), Instruction::Sub))
     return true;
   if (isReassociableOp(Sub->getOperand(1), Instruction::Add) ||
-      isReassociableOp(Sub->getOperand(0), Instruction::Sub))
+      isReassociableOp(Sub->getOperand(1), Instruction::Sub))
     return true;
   if (Sub->hasOneUse() && 
       (isReassociableOp(Sub->use_back(), Instruction::Add) ||