diff --git a/reactos/dll/win32/gdi32/gdi32.def b/reactos/dll/win32/gdi32/gdi32.def
index 10d16e7b7d5..b708fe44c93 100644
--- a/reactos/dll/win32/gdi32/gdi32.def
+++ b/reactos/dll/win32/gdi32/gdi32.def
@@ -338,7 +338,7 @@ GetArcDirection@4
 GetAspectRatioFilterEx@8
 GetBitmapAttributes@4
 GetBitmapBits@12=NtGdiGetBitmapBits@12
-GetBitmapDimensionEx@8=NtGdiGetBitmapDimensionEx@8
+GetBitmapDimensionEx@8=NtGdiGetBitmapDimension@8
 GetBkColor@4=NtGdiGetBkColor@4
 GetBkMode@4=NtGdiGetBkMode@4
 GetBoundsRect@12
diff --git a/reactos/include/reactos/win32k/ntgdibad.h b/reactos/include/reactos/win32k/ntgdibad.h
index 34632abb1b5..86cd79e44d5 100644
--- a/reactos/include/reactos/win32k/ntgdibad.h
+++ b/reactos/include/reactos/win32k/ntgdibad.h
@@ -247,14 +247,6 @@ STDCALL
 NtGdiGetAspectRatioFilterEx(HDC  hDC,
                                  LPSIZE  AspectRatio);
 
-/* Should be done in user-mode using shared GDI Objects. */
-BOOL
-STDCALL
-NtGdiGetBitmapDimensionEx (
-	HBITMAP	hBitmap,
-	LPSIZE	Dimension
-	);
-
 /* Should be done in user-mode using shared GDI Objects. */
 COLORREF STDCALL  NtGdiGetBkColor(HDC  hDC);
 
diff --git a/reactos/subsystems/win32/win32k/objects/bitmaps.c b/reactos/subsystems/win32/win32k/objects/bitmaps.c
index 0a86004dd00..bc6214b5771 100644
--- a/reactos/subsystems/win32/win32k/objects/bitmaps.c
+++ b/reactos/subsystems/win32/win32k/objects/bitmaps.c
@@ -572,7 +572,7 @@ NtGdiExtFloodFill(
 }
 
 BOOL STDCALL
-NtGdiGetBitmapDimensionEx(
+NtGdiGetBitmapDimension(
 	HBITMAP  hBitmap,
 	LPSIZE  Dimension)
 {
diff --git a/reactos/subsystems/win32/win32k/w32ksvc.db b/reactos/subsystems/win32/win32k/w32ksvc.db
index 5604d85a643..4696e8fc5a6 100644
--- a/reactos/subsystems/win32/win32k/w32ksvc.db
+++ b/reactos/subsystems/win32/win32k/w32ksvc.db
@@ -164,7 +164,7 @@ NtGdiFrameRgn                                    5
 NtGdiGetAndSetDCDword                            4
 # NtGdiGetAppClipBox                               2
 NtGdiGetBitmapBits                               3
-# NtGdiGetBitmapDimension                          2
+NtGdiGetBitmapDimension                          2
 NtGdiGetBoundsRect                               3
 # NtGdiGetCharABCWidthsW                           6
 # NtGdiGetCharacterPlacementW                      6
@@ -776,7 +776,6 @@ NtGdiEnumICMProfiles                    3
 NtGdiExtTextOut                         8
 NtGdiGdiComment                         3
 NtGdiGetAspectRatioFilterEx             2
-NtGdiGetBitmapDimensionEx               2
 NtGdiGetBkColor                         1
 NtGdiGetBkMode                          1
 NtGdiGetBrushOrgEx                      2