diff --git a/headers/private/print/libprint/Halftone.h b/headers/private/print/libprint/Halftone.h
index d782748bba..0b97aad2c6 100644
--- a/headers/private/print/libprint/Halftone.h
+++ b/headers/private/print/libprint/Halftone.h
@@ -30,7 +30,7 @@ typedef union {
 } ColorRGB32;
 
 class Halftone;
-typedef int (Halftone::*PFN_dither)(uchar *dst, const uchar *src, int x, int y, int width);
+typedef void (Halftone::*PFN_dither)(uchar *dst, const uchar *src, int x, int y, int width);
 typedef uint (*PFN_gray)(ColorRGB32 c);
 
 class Halftone {
@@ -59,7 +59,7 @@ public:
 	~Halftone();
 	void setPlanes(Planes planes);
 	void setBlackValue(BlackValue blackValue);
-	int dither(uchar *dst, const uchar *src, int x, int y, int width);
+	void dither(uchar *dst, const uchar *src, int x, int y, int width);
 	int getPixelDepth() const;
 	const uchar *getPattern() const;
 	void setPattern(const uchar *pattern);
@@ -74,13 +74,13 @@ protected:
 	void initElements(int x, int y, uchar *elements);
 	uint getDensity(ColorRGB32 c) const;
 	uchar convertUsingBlackValue(uchar byte) const;
-	int ditherRGB32(uchar *dst, const uchar *src, int x, int y, int width);
+	void ditherRGB32(uchar *dst, const uchar *src, int x, int y, int width);
 
 	void initFloydSteinberg();
 	void deleteErrorTables();
 	void uninitFloydSteinberg();
 	void setupErrorBuffer(int x, int y, int width);
-	int ditherFloydSteinberg(uchar *dst, const uchar* src, int x, int y, int width);
+	void ditherFloydSteinberg(uchar *dst, const uchar* src, int x, int y, int width);
 
 	Halftone(const Halftone &);
 	Halftone &operator = (const Halftone &);
diff --git a/src/add-ons/print/drivers/shared/libprint/Halftone.cpp b/src/add-ons/print/drivers/shared/libprint/Halftone.cpp
index 2c8f18e62e..14d982394f 100644
--- a/src/add-ons/print/drivers/shared/libprint/Halftone.cpp
+++ b/src/add-ons/print/drivers/shared/libprint/Halftone.cpp
@@ -135,15 +135,13 @@ void Halftone::initElements(int x, int y, uchar *elements)
 	}
 }
 
-int Halftone::dither(
+void Halftone::dither(
 	uchar *dst,
 	const uchar *src,
 	int x,
 	int y,
 	int width)
 {
-	int result;
-	
 	if (fPlanes == kPlaneRGB1) {
 		switch (fCurrentPlane) {
 			case 0: 
@@ -160,14 +158,13 @@ int Halftone::dither(
 		ASSERT(fGray == &gray);
 	}
 
-	result = (this->*fDither)(dst, src, x, y, width);
+	(this->*fDither)(dst, src, x, y, width);
 
 	// next plane
 	fCurrentPlane ++;
 	if (fCurrentPlane >= fNumberOfPlanes) {
 		fCurrentPlane = 0;
 	}
-	return result;
 }
 
 void Halftone::setGrayFunction(GrayFunction grayFunction)
@@ -186,7 +183,7 @@ void Halftone::setGrayFunction(GrayFunction grayFunction)
 	setGrayFunction(function);
 }
 
-int Halftone::ditherRGB32(
+void Halftone::ditherRGB32(
 	uchar *dst,
 	const uchar *a_src,
 	int x,
@@ -249,8 +246,6 @@ int Halftone::ditherRGB32(
 		}
 		*dst++ = convertUsingBlackValue(cur);
 	}
-
-	return widthByte;
 }
 
 // Floyd-Steinberg dithering
@@ -288,7 +283,7 @@ void Halftone::setupErrorBuffer(int x, int y, int width)
 	}	
 }
 
-int Halftone::ditherFloydSteinberg(uchar *dst, const uchar* a_src, int x, int y, int width)
+void Halftone::ditherFloydSteinberg(uchar *dst, const uchar* a_src, int x, int y, int width)
 {
 	if (fErrorTables[fCurrentPlane] == NULL || fX != x || fCurrentPlane == 0 && fY != y - 1 || fCurrentPlane > 0 && fY != y || fWidth != width) {
 		setupErrorBuffer(x, y, width);