diff --git a/Modules/grpmodule.c b/Modules/grpmodule.c
--- a/Modules/grpmodule.c
+++ b/Modules/grpmodule.c
@@ -69,7 +69,7 @@
             Py_INCREF(Py_None);
     }
 #endif
-    SET(setIndex++, PyLong_FromLong((long) p->gr_gid));
+    SET(setIndex++, PyLong_FromUnsignedLong((unsigned long) p->gr_gid));
     SET(setIndex++, w);
 #undef SET
 
diff --git a/Modules/pwdmodule.c b/Modules/pwdmodule.c
--- a/Modules/pwdmodule.c
+++ b/Modules/pwdmodule.c
@@ -65,7 +65,7 @@
     if (v == NULL)
         return NULL;
 
-#define SETI(i,val) PyStructSequence_SET_ITEM(v, i, PyLong_FromLong((long) val))
+#define SETUL(i,val) PyStructSequence_SET_ITEM(v, i, PyLong_FromUnsignedLong((unsigned long) val))
 #define SETS(i,val) sets(v, i, val)
 
     SETS(setIndex++, p->pw_name);
@@ -74,8 +74,8 @@
 #else
     SETS(setIndex++, p->pw_passwd);
 #endif
-    SETI(setIndex++, p->pw_uid);
-    SETI(setIndex++, p->pw_gid);
+    SETUL(setIndex++, p->pw_uid);
+    SETUL(setIndex++, p->pw_gid);
 #ifdef __VMS
     SETS(setIndex++, "");
 #else
@@ -85,7 +85,7 @@
     SETS(setIndex++, p->pw_shell);
 
 #undef SETS
-#undef SETI
+#undef SETUL
 
     if (PyErr_Occurred()) {
         Py_XDECREF(v);