diff --git a/src/udev/udev-builtin-path_id.c b/src/udev/udev-builtin-path_id.c
index 4db20e4a13..cdd8da3203 100644
--- a/src/udev/udev-builtin-path_id.c
+++ b/src/udev/udev-builtin-path_id.c
@@ -654,7 +654,7 @@ static void add_id_tag(UdevEvent *event, const char *path) {
         size_t i = 0;
 
         /* compose valid udev tag name */
-        for (const char *p = path; *p; p++) {
+        for (const char *p = path; *p && i < sizeof(tag) - 1; p++) {
                 if (ascii_isdigit(*p) ||
                     ascii_isalpha(*p) ||
                     *p == '-') {