diff --git a/reactos/lib/gdi32/objects/font.c b/reactos/lib/gdi32/objects/font.c
index 30519218970..c7495d66434 100644
--- a/reactos/lib/gdi32/objects/font.c
+++ b/reactos/lib/gdi32/objects/font.c
@@ -818,7 +818,7 @@ RemoveFontResourceA(
  */
 DWORD
 STDCALL
-GdiGetCharDimensions(HDC hdc, LPTEXTMETRICW lptm, DWORD *height)
+GdiGetCharDimensions(HDC hdc, LPTEXTMETRICW lptm, LONG *height)
 {
     SIZE sz;
     static const WCHAR alphabet[] = {
diff --git a/reactos/lib/user32/include/user32.h b/reactos/lib/user32/include/user32.h
index 59b7006cf1e..16c59a20c63 100644
--- a/reactos/lib/user32/include/user32.h
+++ b/reactos/lib/user32/include/user32.h
@@ -42,4 +42,4 @@
 
 /* FIXME: FILIP */
 HGDIOBJ STDCALL  NtGdiSelectObject(HDC  hDC, HGDIOBJ  hGDIObj);
-DWORD STDCALL GdiGetCharDimensions(HDC, LPTEXTMETRICW, DWORD *);
+DWORD STDCALL GdiGetCharDimensions(HDC, LPTEXTMETRICW, LONG *);