diff --git a/src/basic/stat-util.c b/src/basic/stat-util.c
index 628d99ac5a..6d1796c315 100644
--- a/src/basic/stat-util.c
+++ b/src/basic/stat-util.c
@@ -471,6 +471,8 @@ int path_is_network_fs(const char *path) {
 }
 
 int proc_mounted(void) {
+        /* This is typically used in error path. So, it is better to not overwrite the original errno. */
+        PROTECT_ERRNO;
         int r;
 
         /* A quick check of procfs is properly mounted */