diff --git a/scripts/fips_crypto_utils.c b/scripts/fips_crypto_utils.c
index d9b9ec8d9f5..ecdf29753dd 100644
--- a/scripts/fips_crypto_utils.c
+++ b/scripts/fips_crypto_utils.c
@@ -13,7 +13,12 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
+int collect_crypto_bytes(const char *in_file, const char *section_name,
+	unsigned long offset, unsigned long size, const char *out_file);
+int update_crypto_hmac(const char *vmlinux_path, const char *hmac_path,
+	unsigned long offset);
 
 int main (int argc, char **argv)
 {