diff --git a/golua/lua/golua_c_lua51.go b/golua/lua/golua_c_lua51.go
index 5348dc6..6b3ba4c 100644
--- a/golua/lua/golua_c_lua51.go
+++ b/golua/lua/golua_c_lua51.go
@@ -1,4 +1,5 @@
-//+build !lua52,!lua53,!lua54
+//go:build !lua52 && !lua53 && !lua54
+// +build !lua52,!lua53,!lua54
 
 package lua
 
@@ -110,8 +111,8 @@ import "C"
 
 import "unsafe"
 
-func luaToInteger(s *C.lua_State, n C.int) C.longlong {
-	return C.lua_tointeger(s, n)
+func luaToInteger(s *C.lua_State, n C.int) C.int {
+	return C.int(C.lua_tointeger(s, n))
 }
 
 func luaToNumber(s *C.lua_State, n C.int) C.double {
diff --git a/golua/lua/golua_c_lua52.go b/golua/lua/golua_c_lua52.go
index 6195393..9cddcdc 100644
--- a/golua/lua/golua_c_lua52.go
+++ b/golua/lua/golua_c_lua52.go
@@ -1,4 +1,5 @@
-//+build lua52
+//go:build lua52
+// +build lua52
 
 package lua
 
@@ -122,8 +123,8 @@ import "C"
 
 import "unsafe"
 
-func luaToInteger(s *C.lua_State, n C.int) C.longlong {
-	return C.lua_tointegerx(s, n, nil)
+func luaToInteger(s *C.lua_State, n C.int) C.int {
+	return C.int(C.lua_tointegerx(s, n, nil))
 }
 
 func luaToNumber(s *C.lua_State, n C.int) C.double {
diff --git a/golua/lua/golua_c_lua53.go b/golua/lua/golua_c_lua53.go
index d490b1b..2346b0c 100644
--- a/golua/lua/golua_c_lua53.go
+++ b/golua/lua/golua_c_lua53.go
@@ -1,4 +1,5 @@
-//+build lua53
+//go:build lua53
+// +build lua53
 
 package lua
 
@@ -122,8 +123,8 @@ import "C"
 
 import "unsafe"
 
-func luaToInteger(s *C.lua_State, n C.int) C.longlong {
-	return C.lua_tointegerx(s, n, nil)
+func luaToInteger(s *C.lua_State, n C.int) C.int {
+	return C.int(C.lua_tointegerx(s, n, nil))
 }
 
 func luaToNumber(s *C.lua_State, n C.int) C.double {
diff --git a/golua/lua/golua_c_lua54.go b/golua/lua/golua_c_lua54.go
index 9acafe5..edcbf24 100644
--- a/golua/lua/golua_c_lua54.go
+++ b/golua/lua/golua_c_lua54.go
@@ -1,4 +1,5 @@
-//+build lua54
+//go:build lua54
+// +build lua54
 
 package lua
 
@@ -124,8 +125,8 @@ import "C"
 
 import "unsafe"
 
-func luaToInteger(s *C.lua_State, n C.int) C.longlong {
-	return C.lua_tointegerx(s, n, nil)
+func luaToInteger(s *C.lua_State, n C.int) C.int {
+	return C.int(C.lua_tointegerx(s, n, nil))
 }
 
 func luaToNumber(s *C.lua_State, n C.int) C.double {