diff --git a/vulkan_codegen.d b/vulkan_codegen.d
index b0fefc5..70c5528 100644
--- a/vulkan_codegen.d
+++ b/vulkan_codegen.d
@@ -1,31 +1,35 @@
-import std.file;
-import std.string;
-import std.path;
-import std.stdio;
-
-void main(string[] argv)
+version(VULKAN_CODEGEN)
 {
-	assert(argv.length > 1, "No argument provided");
+	import std.file;
+	import std.string;
+	import std.path;
+	import std.stdio;
 
-	ubyte[] shader_bytes = cast(ubyte[])read(argv[1]);
-
-	string p = __FILE__.absolutePath;
-	string codegen_name = chomp(p, baseName(p)) ~ "vulkan_shader.d";
-	auto f = File(codegen_name, "w");
-
-	f.write("ubyte[] CONVERT_SHADER_BYTES = [");
-
-	foreach(i, b; shader_bytes)
+	void main(string[] argv)
 	{
-		if (i % 50 == 0)
+		assert(argv.length > 1, "No argument provided");
+
+		ubyte[] shader_bytes = cast(ubyte[])read(argv[1]);
+
+		string p = __FILE__.absolutePath;
+		string codegen_name = chomp(p, baseName(p)) ~ "vulkan_shader.d";
+		auto f = File(codegen_name, "w");
+
+		f.write("ubyte[] CONVERT_SHADER_BYTES = [");
+
+		foreach(i, b; shader_bytes)
 		{
-			f.write("\n\t");
+			if (i % 50 == 0)
+			{
+				f.write("\n\t");
+			}
+
+			f.writef("%d, ", b);
 		}
 
-		f.writef("%d, ", b);
+		f.writeln("\n];");
+
+		f.close();
 	}
-
-	f.writeln("\n];");
-
-	f.close();
 }
+