diff --git a/src/jsapi.c b/src/jsapi.c
index 0d57f79..24ab98e 100644
--- a/src/jsapi.c
+++ b/src/jsapi.c
@@ -561,11 +561,11 @@ static duk_ret_t duk_pmem(duk_context* duk)
 
 	if(index < TIC_PERSISTENT_SIZE)
 	{
-		s32 val = memory->persistent.data[index];
+		u32 val = memory->persistent.data[index];
 
 		if(!duk_is_null_or_undefined(duk, 1))
 		{
-			memory->persistent.data[index] = duk_to_int(duk, 1);
+			memory->persistent.data[index] = duk_to_uint(duk, 1);
 			machine->data->syncPMEM = true;
 		}
 		
diff --git a/src/luaapi.c b/src/luaapi.c
index 0ccf219..9c35199 100644
--- a/src/luaapi.c
+++ b/src/luaapi.c
@@ -1064,11 +1064,11 @@ static s32 lua_pmem(lua_State *lua)
 
 		if(index < TIC_PERSISTENT_SIZE)
 		{
-			s32 val = memory->persistent.data[index];
+			u32 val = memory->persistent.data[index];
 
 			if(top >= 2)
 			{
-				memory->persistent.data[index] = getLuaNumber(lua, 2);
+				memory->persistent.data[index] = lua_tointeger(lua, 2);
 				machine->data->syncPMEM = true;
 			}
 
diff --git a/src/tic.h b/src/tic.h
index ebc7444..bbfa76d 100644
--- a/src/tic.h
+++ b/src/tic.h
@@ -401,7 +401,7 @@ typedef union
 
 typedef struct
 {
-	s32 data[TIC_PERSISTENT_SIZE];
+	u32 data[TIC_PERSISTENT_SIZE];
 } tic_persistent;
 
 typedef union
diff --git a/src/wrenapi.c b/src/wrenapi.c
index 2d7e16e..182e70a 100644
--- a/src/wrenapi.c
+++ b/src/wrenapi.c
@@ -900,7 +900,7 @@ static void wren_pmem(WrenVM* vm)
 
 	if(index < TIC_PERSISTENT_SIZE)
 	{
-		s32 val = memory->persistent.data[index];
+		u32 val = memory->persistent.data[index];
 
 		if(top > 2)
 		{