Fix compiler warnings
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 975cd9a..fe92491 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -7756,9 +7756,9 @@
     PyObject *os1, *os2;
     char *s1, *s2;
     char *newenv;
+    size_t len;
 #endif
     PyObject *newstr = NULL;
-    size_t len;
 
 #ifdef MS_WINDOWS
     if (!PyArg_ParseTuple(args,