diff --git a/lodash.js b/lodash.js
index fed6cd91e..c63dc3116 100644
--- a/lodash.js
+++ b/lodash.js
@@ -4270,9 +4270,9 @@
           isCommon = newBitmask < ARY_FLAG;
 
       var isCombo =
-        (srcBitmask == ARY_FLAG && bitmask == CURRY_FLAG) ||
-        (srcBitmask == ARY_FLAG && bitmask == REARG_FLAG && data[7].length <= source[8]) ||
-        (srcBitmask == (ARY_FLAG | REARG_FLAG) && bitmask == CURRY_FLAG);
+        (srcBitmask == ARY_FLAG && (bitmask == CURRY_FLAG)) ||
+        (srcBitmask == ARY_FLAG && (bitmask == REARG_FLAG) && (data[7].length <= source[8])) ||
+        (srcBitmask == (ARY_FLAG | REARG_FLAG) && (source[7].length <= source[8]) && (bitmask == CURRY_FLAG));
 
       // Exit early if metadata can't be merged.
       if (!(isCommon || isCombo)) {