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-rw-r--r--firmware/common/sprintf.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/firmware/common/sprintf.h b/firmware/common/sprintf.h
index be79683..7597151 100644
--- a/firmware/common/sprintf.h
+++ b/firmware/common/sprintf.h
@@ -20,6 +20,8 @@
#ifndef __SPRINTF_H__
#define __SPRINTF_H__
+#include <stddef.h>
+
int snprintf (char *buf, size_t size, const char *fmt, ...);
#endif /* __SPRINTF_H__ */