diff --git a/Source/Libs/GLibSharp/HookList.cs b/Source/Libs/GLibSharp/HookList.cs
index 3498454f5..7af30e4e3 100644
--- a/Source/Libs/GLibSharp/HookList.cs
+++ b/Source/Libs/GLibSharp/HookList.cs
@@ -31,7 +31,7 @@ namespace GLib {
 						),
 				new GLib.AbiField("is_setup"
 						, -1
-						, (uint) sizeof(uint) // is_setup
+						, (uint) Marshal.SizeOf<bool>() // is_setup
 						, "hook_size"
 						, "hooks"
 						, 1
diff --git a/Source/Tools/GapiCodegen/GenerationInfo.cs b/Source/Tools/GapiCodegen/GenerationInfo.cs
index 6ced13550..6ef86b008 100644
--- a/Source/Tools/GapiCodegen/GenerationInfo.cs
+++ b/Source/Tools/GapiCodegen/GenerationInfo.cs
@@ -253,10 +253,6 @@ namespace GtkSharp.Generation {
 			if (isBlittable)
 				return "sizeof( " + cstype + " )";
 
-			// This is optimization based on https://github.com/GtkSharp/GtkSharp/pull/261#discussion_r673381869
-			if (cstype == "bool")
-				return "sizeof( uint )";
-
 			return "Marshal.SizeOf<" + cstype + ">()";
 		}
 	}