diff --git a/comctl32.go b/comctl32.go
index 144affa7..e9617e7a 100644
--- a/comctl32.go
+++ b/comctl32.go
@@ -361,7 +361,7 @@ func InitCommonControlsEx(lpInitCtrls *INITCOMMONCONTROLSEX) bool {
 
 func LoadIconMetric(hInstance HINSTANCE, lpIconName *uint16, lims int32, hicon *HICON) HRESULT {
 	if loadIconMetric.Find() != nil {
-		return HRESULT(0)
+		return -((E_NOTIMPL ^ 0xFFFFFFFF) + 1)
 	}
 	ret, _, _ := syscall.Syscall6(loadIconMetric.Addr(), 4,
 		uintptr(hInstance),
@@ -376,7 +376,7 @@ func LoadIconMetric(hInstance HINSTANCE, lpIconName *uint16, lims int32, hicon *
 
 func LoadIconWithScaleDown(hInstance HINSTANCE, lpIconName *uint16, w int32, h int32, hicon *HICON) HRESULT {
 	if loadIconWithScaleDown.Find() != nil {
-		return HRESULT(0)
+		return -((E_NOTIMPL ^ 0xFFFFFFFF) + 1)
 	}
 	ret, _, _ := syscall.Syscall6(loadIconWithScaleDown.Addr(), 5,
 		uintptr(hInstance),
diff --git a/shell32.go b/shell32.go
index 8c683aec..cd3790dc 100644
--- a/shell32.go
+++ b/shell32.go
@@ -459,7 +459,7 @@ func SHParseDisplayName(pszName *uint16, pbc uintptr, ppidl *uintptr, sfgaoIn ui
 
 func SHGetStockIconInfo(stockIconId int32, uFlags uint32, stockIcon *SHSTOCKICONINFO) HRESULT {
 	if shGetStockIconInfo.Find() != nil {
-		return HRESULT(0)
+		return -((E_NOTIMPL ^ 0xFFFFFFFF) + 1)
 	}
 	ret, _, _ := syscall.Syscall6(shGetStockIconInfo.Addr(), 3,
 		uintptr(stockIconId),
diff --git a/uxtheme.go b/uxtheme.go
index 1f24cac9..3fe6214a 100644
--- a/uxtheme.go
+++ b/uxtheme.go
@@ -535,7 +535,7 @@ func DrawThemeBackground(hTheme HTHEME, hdc HDC, iPartId, iStateId int32, pRect,
 
 func DrawThemeTextEx(hTheme HTHEME, hdc HDC, iPartId, iStateId int32, pszText *uint16, iCharCount int32, dwFlags uint32, pRect *RECT, pOptions *DTTOPTS) HRESULT {
 	if drawThemeTextEx.Find() != nil {
-		return HRESULT(0)
+		return -((E_NOTIMPL ^ 0xFFFFFFFF) + 1)
 	}
 	ret, _, _ := syscall.Syscall9(drawThemeTextEx.Addr(), 9,
 		uintptr(hTheme),