diff --git a/include/dicformat/decls.h b/include/dicformat/decls.h
index ab5938f..a414cf8 100644
--- a/include/dicformat/decls.h
+++ b/include/dicformat/decls.h
@@ -34,6 +34,7 @@
 #define LIBDICFORMAT_DECLS_H
 
 #include <stdint.h>
+#include <stdio.h>
 
 int identify(const char *filename);