diff --git a/dlls/gdiplus/gdiplus.spec b/dlls/gdiplus/gdiplus.spec
index 185354de90e..11821338486 100644
--- a/dlls/gdiplus/gdiplus.spec
+++ b/dlls/gdiplus/gdiplus.spec
@@ -441,7 +441,7 @@
 @ stdcall GdipLoadImageFromStreamICM(ptr ptr)
 @ stub GdipMeasureCharacterRanges
 @ stub GdipMeasureDriverString
-@ stdcall GdipMeasureString(ptr ptr long ptr ptr ptr ptr ptr ptr)
+@ stdcall GdipMeasureString(ptr wstr long ptr ptr ptr ptr ptr ptr)
 @ stub GdipMultiplyLineTransform
 @ stdcall GdipMultiplyMatrix(ptr ptr long)
 @ stub GdipMultiplyPathGradientTransform