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-rw-r--r--src/dispextern.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/dispextern.h b/src/dispextern.h
index 5516d13688..63eb3b8906 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1320,7 +1320,7 @@ struct face_cache
face doesn't exist. */
#define FACE_FROM_ID(F, ID) \
- (((ID) >= 0 && (ID) < FRAME_FACE_CACHE (F)->used) \
+ (((unsigned) (ID) < FRAME_FACE_CACHE (F)->used) \
? FRAME_FACE_CACHE (F)->faces_by_id[ID] \
: NULL)