diff --git a/lib/test_static_keys.c b/lib/test_static_keys.c
index 81d8105..c61b299 100644
--- a/lib/test_static_keys.c
+++ b/lib/test_static_keys.c
@@ -70,7 +70,7 @@
 	}
 }
 
-int verify_keys(struct test_key *keys, int size, bool invert)
+static int verify_keys(struct test_key *keys, int size, bool invert)
 {
 	int i;
 	bool ret, init;