diff --git a/parse.y b/parse.y
index e043e99e2e..a025a51db7 100644
--- a/parse.y
+++ b/parse.y
@@ -6739,9 +6739,7 @@ parser_prepare(struct parser_params *parser)
 #define ambiguous_operator(op, syn) dispatch2(operator_ambiguous, ripper_intern(op), rb_str_new_cstr(syn))
 #endif
 #define warn_balanced(op, syn) ((void) \
-    (last_state != EXPR_CLASS && last_state != EXPR_DOT && \
-     last_state != EXPR_FNAME && last_state != EXPR_ENDFN && \
-     last_state != EXPR_ENDARG && \
+    (!(last_state & (EXPR_CLASS|EXPR_DOT|EXPR_FNAME|EXPR_ENDFN|EXPR_ENDARG)) && \
      space_seen && !ISSPACE(c) && \
      (ambiguous_operator(op, syn), 0)))