Include <stddef.h>, for ptrdiff_t.

diff --git a/tests/test-vasnprintf-posix.c b/tests/test-vasnprintf-posix.c
index 5c92275..791d6c7 100644 (file)
--- a/tests/test-vasnprintf-posix.c
+++ b/tests/test-vasnprintf-posix.c
@@ -24,6 +24,7 @@
 #include "vasnprintf.h"
 
 #include <stdarg.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>