diff --git a/keystore/keystore.cpp b/keystore/keystore.cpp
index ef4c7d4..ea58ad6 100644
--- a/keystore/keystore.cpp
+++ b/keystore/keystore.cpp
@@ -1331,7 +1331,7 @@
 static struct action {
     ResponseCode (*run)(KeyStore* keyStore, int sock, uid_t uid, Value* param1, Value* param2,
             Value* param3);
-    int8_t code;
+    uint8_t code;
     State state;
     uint32_t perm;
     int lengths[MAX_PARAM];
@@ -1364,11 +1364,11 @@
     uid_t euid;
     uint32_t perms;
 } users[] = {
-    {AID_SYSTEM,   ~0,         ~0},
-    {AID_VPN,      AID_SYSTEM, P_GET | P_SIGN | P_VERIFY },
-    {AID_WIFI,     AID_SYSTEM, P_GET | P_SIGN | P_VERIFY },
-    {AID_ROOT,     AID_SYSTEM, P_GET},
-    {~0,           ~0,         P_TEST | P_GET | P_INSERT | P_DELETE | P_EXIST | P_SAW |
+    {AID_SYSTEM,  (uid_t)(~0), (uint32_t)(~0)},
+    {AID_VPN,     AID_SYSTEM,  P_GET | P_SIGN | P_VERIFY },
+    {AID_WIFI,    AID_SYSTEM,  P_GET | P_SIGN | P_VERIFY },
+    {AID_ROOT,    AID_SYSTEM,  P_GET},
+    {(uid_t)(~0), (uid_t)(~0), P_TEST | P_GET | P_INSERT | P_DELETE | P_EXIST | P_SAW |
                                P_SIGN | P_VERIFY},
 };