diff --git a/acorn.js b/acorn.js
index 3cf3f06e87..fc8a0a342f 100644
--- a/acorn.js
+++ b/acorn.js
@@ -2516,7 +2516,7 @@
         next();
         var start = storeCurrentPos();
         if(op.rightAssociative) {
-          node.right = parseExprOp(parseMaybeUnary(), start, prec - 1, noIn);
+          node.right = parseExprOp(parseMaybeUnary(), start, minPrec, noIn);
         } else {
           node.right = parseExprOp(parseMaybeUnary(), start, prec, noIn);
         }