1 files changed, 1 insertions, 1 deletions
diff --git a/parse.y b/parse.y
index bda3f8f5f7..87c20b99a1 100644
--- a/parse.y
+++ b/parse.y
@@ -73,7 +73,7 @@ typedef unsigned long stack_type;
 # endif
 
 # define BITSTACK_PUSH(stack, n)	(stack = (stack<<1)|((n)&1))
-# define BITSTACK_POP(stack)	(stack >>= 1)
+# define BITSTACK_POP(stack)	(stack = stack >> 1)
 # define BITSTACK_LEXPOP(stack)	(stack = (stack >> 1) | (stack & 1))
 # define BITSTACK_SET_P(stack)	(stack&1)