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-rw-r--r--include/assert.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/assert.h b/include/assert.h
index 5305715..fc07e16 100644
--- a/include/assert.h
+++ b/include/assert.h
@@ -67,7 +67,7 @@
# ifdef assert_perror
# undef assert_perror
# endif
-# ifdef NDEBUG
+# if defined(NDEBUG)
# define assert_perror(errnum) ((void)0)
# elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define assert_perror(errnum) \