diff --git a/src/pkcs15init/pkcs15-lib.c b/src/pkcs15init/pkcs15-lib.c
index 309b23b3..5658aff2 100644
--- a/src/pkcs15init/pkcs15-lib.c
+++ b/src/pkcs15init/pkcs15-lib.c
@@ -163,7 +163,7 @@ static struct sc_pkcs15init_callbacks callbacks = {
 	NULL,
 };
 
-void sc_pkcs15init_empty_callback(void *ptr)
+static void sc_pkcs15init_empty_callback(void *ptr)
 {
 }