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-rw-r--r--tests/test-isblank.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/tests/test-isblank.c b/tests/test-isblank.c
index f25d26d05b..d29fc63338 100644
--- a/tests/test-isblank.c
+++ b/tests/test-isblank.c
@@ -20,6 +20,9 @@
#include <ctype.h>
+#include "signature.h"
+SIGNATURE_CHECK (isblank, int, (int));
+
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>