diff --git a/shared/systemd/nm-sd-utils-shared.c b/shared/systemd/nm-sd-utils-shared.c
index 7206fa52b9..ee297ceaab 100644
--- a/shared/systemd/nm-sd-utils-shared.c
+++ b/shared/systemd/nm-sd-utils-shared.c
@@ -52,7 +52,7 @@ nm_sd_utils_path_startswith (const char *path, const char *prefix)
 
 /*****************************************************************************/
 
-gboolean
+int
 nm_sd_utils_unbase64char (char ch, gboolean accept_padding_equal)
 {
 	if (   ch == '='