1 files changed, 2 insertions, 2 deletions
diff --git a/mem.h b/mem.h
index 84fa4bb..87f817b 100644
--- a/mem.h
+++ b/mem.h
@@ -15,12 +15,12 @@ void *M(State *S, void *ptr, size_t old, size_t new);
 
 // needs len,cap,d fields
 #define ENSURE_CAP(S, darr, type, needed) \
-	if (darr.cap < needed) { \
+	do { if (darr.cap < needed) { \
 		size_t __newsz = next_pwrof2(needed); \
 	    if (__newsz < 8) __newsz = 8; \
 		darr.d = RENEW_ARR(S, darr.d, type, darr.cap, __newsz); \
 	    darr.cap = __newsz; \
-	}
+	} } while (0)
 
 size_t next_pwrof2(size_t x);