diff --git a/lib/xstrtol.c b/lib/xstrtol.c
index 621f67370..befa2f7c9 100644
--- a/lib/xstrtol.c
+++ b/lib/xstrtol.c
@@ -34,7 +34,6 @@
 # endif
 #endif
 
-#define NDEBUG
 #include <assert.h>
 
 #include <errno.h>