diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 4607b18..c205dd9 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -5106,7 +5106,7 @@
             return NULL;
         }
         if (i == 0 && !argvlist[0][0]) {
-            free_string_array(argvlist, i);
+            free_string_array(argvlist, i + 1);
             PyErr_SetString(
                 PyExc_ValueError,
                 "spawnv() arg 2 first element cannot be empty");