1 files changed, 1 insertions, 0 deletions
diff --git a/strio.h b/strio.h
index 9edd306..aede41c 100644
--- a/strio.h
+++ b/strio.h
@@ -30,6 +30,7 @@ const char *cstr_fmt(Arena *arena, const char *fmt, ...);
 
 #if defined(__linux__) || defined(_POSIX_C_SOURCE)
 #include <sys/stat.h>
+int fileno(FILE *);
 static inline long read_all_file_size(FILE *f) {
 	struct stat b;
 	if (fstat(fileno(f), &b)) return -1;