diff --git a/src/plugins_types/instanceid.c b/src/plugins_types/instanceid.c
index 53a1de1..3971c36 100644
--- a/src/plugins_types/instanceid.c
+++ b/src/plugins_types/instanceid.c
@@ -51,7 +51,7 @@
     LY_ARRAY_COUNT_TYPE u, v;
     char *result = NULL, quot;
     const struct lys_module *mod = NULL, *local_mod = NULL;
-    struct ly_set *mods;
+    struct ly_set *mods = NULL;
     ly_bool inherit_prefix = 0, d;
     const char *strval;