diff --git a/SHAMap.h b/SHAMap.h
index 0e35f6b4b..342f50fec 100644
--- a/SHAMap.h
+++ b/SHAMap.h
@@ -164,7 +164,7 @@ public:
 	TNType getType() const { return mType; }
 
 	// type functions
-	bool isLeaf() const { return mType==TRANSACTION || mType==ACCOUNT_STATE; }
+	bool isLeaf() const { return (mType==TRANSACTION) || (mType==ACCOUNT_STATE); }
 	bool isInner() const { return mType==INNER; }
 	bool isValid() const { return mType!=ERROR; }
 	bool isTransaction() const { return mType!=TRANSACTION; }