diff --git a/src/modules/module_27700.c b/src/modules/module_27700.c
index 7e2c4bc53..4bd32efdc 100644
--- a/src/modules/module_27700.c
+++ b/src/modules/module_27700.c
@@ -400,7 +400,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
 
 int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const void *digest_buf, MAYBE_UNUSED const salt_t *salt, MAYBE_UNUSED const void *esalt_buf, MAYBE_UNUSED const void *hook_salt_buf, MAYBE_UNUSED const hashinfo_t *hash_info, char *line_buf, MAYBE_UNUSED const int line_size)
 {
-  const int line_len = snprintf (line_buf, line_size, "%s%u*%lu*%lu*%lu*%08x%08x*%08x%08x%08x%08x%08x%08x%08x%08x",
+  const int line_len = snprintf (line_buf, line_size, "%s%u*%" PRIu64 "*%" PRIu64 "*%" PRIu64 "*%08x%08x*%08x%08x%08x%08x%08x%08x%08x%08x",
     SIGNATURE_MULTIBIT,
     3,
     SCRYPT_N,