Fix #ifdef

diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 2b42e0a8898af6859aebb05952260311d74347fd..9924b63dff18b59b7b1620886456b6f36e0c5e4f 100644 (file)
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -61,7 +61,7 @@ typedef struct BLOCK {
  * block is freed leaving another existing block as the new endpoint.
  */
 
-#if Py_DEBUG
+#ifdef Py_DEBUG
 #define MARK_END(link)  link = NULL;
 #define CHECK_END(link) assert(link == NULL);
 #define CHECK_NOT_END(link) assert(link != NULL);