diff --git a/src/libstrongswan/plugins/gcrypt/gcrypt_dh.c b/src/libstrongswan/plugins/gcrypt/gcrypt_dh.c
index f59144a86..b57f05e3a 100644
--- a/src/libstrongswan/plugins/gcrypt/gcrypt_dh.c
+++ b/src/libstrongswan/plugins/gcrypt/gcrypt_dh.c
@@ -195,8 +195,8 @@ METHOD(diffie_hellman_t, destroy, void,
 /*
  * Generic internal constructor
  */
-gcrypt_dh_t *create_generic(diffie_hellman_group_t group, size_t exp_len,
-							chunk_t g, chunk_t p)
+static gcrypt_dh_t *create_generic(diffie_hellman_group_t group, size_t exp_len,
+								   chunk_t g, chunk_t p)
 {
 	private_gcrypt_dh_t *this;
 	gcry_error_t err;