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-rw-r--r--Modules/_collectionsmodule.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 2b42e0a..9924b63 100644
--- 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);