diff --git a/basis/ui/backend/windows/windows.factor b/basis/ui/backend/windows/windows.factor
index 64e87e0a4c..6ccb53e8b2 100755
--- a/basis/ui/backend/windows/windows.factor
+++ b/basis/ui/backend/windows/windows.factor
@@ -589,19 +589,18 @@ M: windows-ui-backend do-events
     ] if ;
 
 :: register-window-class ( class-name-ptr -- )
-    "WNDCLASSEX" <c-object> f GetModuleHandle
+    WNDCLASSEX <struct> f GetModuleHandle
     class-name-ptr pick GetClassInfoEx 0 = [
-        "WNDCLASSEX" heap-size over set-WNDCLASSEX-cbSize
-        { CS_HREDRAW CS_VREDRAW CS_OWNDC } flags over set-WNDCLASSEX-style
-        ui-wndproc over set-WNDCLASSEX-lpfnWndProc
-        0 over set-WNDCLASSEX-cbClsExtra
-        0 over set-WNDCLASSEX-cbWndExtra
-        f GetModuleHandle over set-WNDCLASSEX-hInstance
-        f GetModuleHandle "fraptor" utf16n string>alien LoadIcon
-        over set-WNDCLASSEX-hIcon
-        f IDC_ARROW LoadCursor over set-WNDCLASSEX-hCursor
+        WNDCLASSEX heap-size >>cbSize
+        { CS_HREDRAW CS_VREDRAW CS_OWNDC } flags >>style
+        ui-wndproc >>lpfnWndProc
+        0 >>cbClsExtra
+        0 >>cbWndExtra
+        f GetModuleHandle >>hInstance
+        f GetModuleHandle "fraptor" utf16n string>alien LoadIcon >>hIcon
+        f IDC_ARROW LoadCursor >>hCursor
 
-        class-name-ptr over set-WNDCLASSEX-lpszClassName
+        class-name-ptr >>lpszClassName
         RegisterClassEx win32-error=0/f
     ] [ drop ] if ;
 
diff --git a/basis/windows/types/types.factor b/basis/windows/types/types.factor
index 36823db424..37505210b5 100755
--- a/basis/windows/types/types.factor
+++ b/basis/windows/types/types.factor
@@ -228,19 +228,19 @@ C-STRUCT: WNDCLASS
     { "LPCTSTR" "lpszMenuName" }
     { "LPCTSTR" "lpszClassName" } ;
 
-C-STRUCT: WNDCLASSEX
-    { "UINT" "cbSize" }
-    { "UINT" "style" }
-    { "WNDPROC" "lpfnWndProc" }
-    { "int" "cbClsExtra" }
-    { "int" "cbWndExtra" }
-    { "HINSTANCE" "hInstance" }
-    { "HICON" "hIcon" }
-    { "HCURSOR" "hCursor" }
-    { "HBRUSH" "hbrBackground" }
-    { "LPCTSTR" "lpszMenuName" }
-    { "LPCTSTR" "lpszClassName" }
-    { "HICON" "hIconSm" } ;
+STRUCT: WNDCLASSEX
+    { cbSize UINT }
+    { style UINT }
+    { lpfnWndProc WNDPROC }
+    { cbClsExtra int }
+    { cbWndExtra int }
+    { hInstance HINSTANCE }
+    { hIcon HICON }
+    { hCursor HCURSOR }
+    { hbrBackground HBRUSH }
+    { lpszMenuName LPCTSTR }
+    { lpszClassName LPCTSTR }
+    { hIconSm HICON } ;
 
 C-STRUCT: RECT
     { "LONG" "left" }