diff --git a/sources/assert.c b/sources/assert.c
index c8be834..7edac17 100644
--- a/sources/assert.c
+++ b/sources/assert.c
@@ -1,5 +1,5 @@
-// TODO: Replace standard headers when possible.
 #include <stdio.h>
+#include <stdlib.h>
 #include "malunal/assert.h"
 
 static
@@ -21,7 +21,7 @@ assertion_test(
   malunal_cstr_t  file,
   malunal_int32_t line
 ) {
-	if (!cond) assertion_failed(expr, msg, file, line);
+	if (!cond) assert_failed(expr, msg, file, line);
 }
 
 malunal_void_t