diff --git a/src/deh_lua.c b/src/deh_lua.c
index 16b3dcfb1..082a8e459 100644
--- a/src/deh_lua.c
+++ b/src/deh_lua.c
@@ -513,8 +513,8 @@ static int ScanConstants(lua_State *L, boolean mathlib, const char *word)
 		if (mathlib) return luaL_error(L, "sfx '%s' could not be found.\n", word);
 		return 0;
 	}
-	else if (!mathlib && fastncmp("k_",word,5)) {
-		p = word+5;
+	else if (!mathlib && fastncmp("k_",word,2)) {
+		p = word+2;
 		for (i = 0; i < NUMKARTSTUFF; i++)
 			if (fasticmp(p, KARTSTUFF_LIST[i])) {
 				lua_pushinteger(L, i);
@@ -522,8 +522,8 @@ static int ScanConstants(lua_State *L, boolean mathlib, const char *word)
 			}
 		return 0;
 	}
-	else if (mathlib && fastncmp("K_",word,5)) { // SOCs are ALL CAPS!
-		p = word+5;
+	else if (mathlib && fastncmp("K_",word,2)) { // SOCs are ALL CAPS!
+		p = word+2;
 		for (i = 0; i < NUMKARTSTUFF; i++)
 			if (fastcmp(p, KARTSTUFF_LIST[i])) {
 				lua_pushinteger(L, i);
diff --git a/src/lua_playerlib.c b/src/lua_playerlib.c
index 0191e8e12..7a4720f55 100644
--- a/src/lua_playerlib.c
+++ b/src/lua_playerlib.c
@@ -910,6 +910,7 @@ static int kartstuff_get(lua_State *L)
 static int kartstuff_set(lua_State *L)
 {
 	INT32 *kartstuff = *((INT32 **)luaL_checkudata(L, 1, META_KARTSTUFF));
+	player_t *plr = (player_t*)(kartstuff - offsetof(player_t, kartstuff));
 	kartstufftype_t ks = luaL_checkinteger(L, 2);
 	INT32 i = (INT32)luaL_checkinteger(L, 3);
 
@@ -919,7 +920,17 @@ static int kartstuff_set(lua_State *L)
 		return luaL_error(L, "Do not alter player_t in HUD rendering code!");
 	if (hook_cmd_running)
 		return luaL_error(L, "Do not alter player_t in CMD building code!");
-	kartstuff[ks] = i;
+
+	switch (ks)
+	{
+		case k_sneakertimer:
+			plr->sneakertimer = i;
+			break;
+
+		default:
+			return luaL_error(L, LUA_QL("kartstufftype_t") " cannot be %u", ks);
+	}
+
 	return 0;
 }