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-rw-r--r--src/stdlib/strtoul.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stdlib/strtoul.c b/src/stdlib/strtoul.c
index 414b5897..8ef4eb34 100644
--- a/src/stdlib/strtoul.c
+++ b/src/stdlib/strtoul.c
@@ -1,4 +1,5 @@
#include <stdlib.h>
+#include "ctype.h"
#include "errno.h"
#include "limits.h"