diff --git a/apps/twnlua/CMakeLists.txt b/apps/twnlua/CMakeLists.txt
index 4f17bd0..ce46540 100644
--- a/apps/twnlua/CMakeLists.txt
+++ b/apps/twnlua/CMakeLists.txt
@@ -30,7 +30,7 @@ add_custom_target(
     DEPENDS ${TWN_OUT_DIR}/data/scripts/twnapi.lua
 )
 
-add_compile_definitions(LUA_32BITS)
+add_compile_definitions(LUA_32BITS=1)
 
 set(SOURCE_FILES
         game.c
diff --git a/apps/twnlua/bindgen.py b/apps/twnlua/bindgen.py
index e0eff55..93b3ddc 100755
--- a/apps/twnlua/bindgen.py
+++ b/apps/twnlua/bindgen.py
@@ -36,7 +36,7 @@ def to_table(typedesc, variable, indent = 0):
     binding = ' ' * indent + "lua_createtable(L, 0, %i);\n" % len(typedesc["fields"])
     for field in typedesc["fields"]:
         if field["type"] == "float" or field["type"] == "uint8_t":
-            binding += ' ' * indent + "lua_pushnumber(L, (double)(%s));\n" % (variable + ".%s" % field["name"])
+            binding += ' ' * indent + "lua_pushnumber(L, (float)(%s));\n" % (variable + ".%s" % field["name"])
         elif field["type"] == "bool":
             binding += ' ' * indent + "lua_pushboolean(L, (%s));\n" % (variable + ".%s" % field["name"])
         elif field["type"] in api["types"]:
@@ -109,7 +109,7 @@ for procedure, procedure_desc in api["procedures"].items():
         if procedure_desc["return"] == "bool":
             binding += "    lua_pushboolean(L, (int)(%s(%s)));\n" % (procedure, ", ".join(param["name"] for param in procedure_desc["params"]))
         elif procedure_desc["return"] == "float":
-            binding += "    lua_pushnumber(L, (double)(%s(%s)));\n" % (procedure, ", ".join(param["name"] for param in procedure_desc["params"]))
+            binding += "    lua_pushnumber(L, (float)(%s(%s)));\n" % (procedure, ", ".join(param["name"] for param in procedure_desc["params"]))
         elif procedure_desc["return"] == "char *":
             binding += "    lua_pushstring(L, %s(%s));\n" % (procedure, ", ".join(param["name"] for param in procedure_desc["params"]))
         elif type(procedure_desc["return"]) is dict or procedure_desc["return"] in api["types"]:
diff --git a/apps/twnlua/minilua.h b/apps/twnlua/minilua.h
index 58a61aa..0b8c7f8 100644
--- a/apps/twnlua/minilua.h
+++ b/apps/twnlua/minilua.h
@@ -210,8 +210,9 @@ extern "C" {
 /*
 @@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats.
 */
+#if !defined(LUA_32BITS)
 #define LUA_32BITS	0
-
+#endif
 
 /*
 @@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for