diff --git a/src/add-ons/print/drivers/pdf/source/PDFWriter.cpp b/src/add-ons/print/drivers/pdf/source/PDFWriter.cpp
index 7c1dd52957..bd89f23938 100644
--- a/src/add-ons/print/drivers/pdf/source/PDFWriter.cpp
+++ b/src/add-ons/print/drivers/pdf/source/PDFWriter.cpp
@@ -1106,7 +1106,7 @@ PDFWriter::IsTransparentGRAY1(uint8* in, int8 bit)
 
 
 // --------------------------------------------------
-void *
+uint8 *
 PDFWriter::CreateMask(BRect src, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data)
 {
 	uint8	*in;
@@ -1206,7 +1206,7 @@ PDFWriter::AlphaFromRGBA32_BIG(uint8* in)
 
 
 // --------------------------------------------------
-void *
+uint8 *
 PDFWriter::CreateSoftMask(BRect src, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data)
 {
 	static bool errorReported = false;
@@ -1606,7 +1606,7 @@ bool
 PDFWriter::GetImages(BRect src, int32 /*width*/, int32 /*height*/, int32 bytesPerRow, int32 pixelFormat, 
 	int32 flags, void *data, int* maskId, int* image)
 {
-	void 	*mask = NULL;
+	uint8 	*mask = NULL;
 	*maskId = -1;
 
 	int32 width = src.IntegerWidth() + 1;
diff --git a/src/add-ons/print/drivers/pdf/source/PDFWriter.h b/src/add-ons/print/drivers/pdf/source/PDFWriter.h
index 8c77275f80..e979a2ec1d 100644
--- a/src/add-ons/print/drivers/pdf/source/PDFWriter.h
+++ b/src/add-ons/print/drivers/pdf/source/PDFWriter.h
@@ -134,8 +134,8 @@ class PDFWriter : public PrinterDriver, public PictureIterator
 		inline void ConvertFromGRAY8(uint8* in, uint8* out);
 		inline void ConvertFromGRAY1(uint8* in, uint8* out, int8 bit);
 
-		void		*CreateMask(BRect src, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data);
-		void		*CreateSoftMask(BRect src, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data);
+		uint8		*CreateMask(BRect src, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data);
+		uint8		*CreateSoftMask(BRect src, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data);
 		BBitmap		*ConvertBitmap(BRect src, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data);
 		bool		GetImages(BRect src, int32 width, int32 height, int32 bytesPerRow, int32 pixelFormat, int32 flags, void *data, int* mask, int* image);