diff --git a/src/vbox/vbox_tmpl.c b/src/vbox/vbox_tmpl.c
index 05b075fddd..14fdcdaea6 100644
--- a/src/vbox/vbox_tmpl.c
+++ b/src/vbox/vbox_tmpl.c
@@ -598,7 +598,9 @@ static int PRUnicharToInt(PRUnichar *strUtf16) {
     if (!strUtf8)
         return -1;
 
-    ret = atoi(strUtf8);
+    if (virStrToLong_i(strUtf8, NULL, 10, &ret) < 0)
+        ret = -1;
+
     g_pVBoxGlobalData->pFuncs->pfnUtf8Free(strUtf8);
 
     return ret;