1 files changed, 1 insertions, 0 deletions

diff --git a/array.c b/array.c
index 05fcc1c58f..dbb40db508 100644
--- a/array.c
+++ b/array.c
@@ -32,6 +32,7 @@
 #include "builtin.h"
 
 #if !ARRAY_DEBUG
+# undef NDEBUG
 # define NDEBUG
 #endif
 #include "ruby_assert.h"