diff --git a/source/Irrlicht/COpenGLCoreTexture.h b/source/Irrlicht/COpenGLCoreTexture.h
index c431ee9a..ccd37704 100644
--- a/source/Irrlicht/COpenGLCoreTexture.h
+++ b/source/Irrlicht/COpenGLCoreTexture.h
@@ -639,7 +639,7 @@ protected:
 	GLint InternalFormat;
 	GLenum PixelFormat;
 	GLenum PixelType;
-	void (*Converter)(const void*, s32, void*);
+	void (*Converter)(const void*, u32, void*);
 
 	bool LockReadOnly;
 	IImage* LockImage;
diff --git a/source/Irrlicht/COpenGLDriver.cpp b/source/Irrlicht/COpenGLDriver.cpp
index 2c7469eb..ed6bda9b 100644
--- a/source/Irrlicht/COpenGLDriver.cpp
+++ b/source/Irrlicht/COpenGLDriver.cpp
@@ -3612,7 +3612,7 @@ bool COpenGLDriver::queryTextureFormat(ECOLOR_FORMAT format) const
 	GLint dummyInternalFormat;
 	GLenum dummyPixelFormat;
 	GLenum dummyPixelType;
-	void (*dummyConverter)(const void*, s32, void*);
+	void (*dummyConverter)(const void*, u32, void*);
 	return getColorFormatParameters(format, dummyInternalFormat, dummyPixelFormat, dummyPixelType, &dummyConverter);
 }
 
@@ -4201,7 +4201,7 @@ GLenum COpenGLDriver::getZBufferBits() const
 }
 
 bool COpenGLDriver::getColorFormatParameters(ECOLOR_FORMAT format, GLint& internalFormat, GLenum& pixelFormat,
-	GLenum& pixelType, void(**converter)(const void*, s32, void*)) const
+	GLenum& pixelType, void(**converter)(const void*, u32, void*)) const
 {
 	// NOTE: Converter variable not used here, but don't remove, it's used in the OGL-ES drivers.
 
diff --git a/source/Irrlicht/COpenGLDriver.h b/source/Irrlicht/COpenGLDriver.h
index 333c626d..90809eae 100644
--- a/source/Irrlicht/COpenGLDriver.h
+++ b/source/Irrlicht/COpenGLDriver.h
@@ -404,7 +404,7 @@ namespace video
 		GLenum getZBufferBits() const;
 
 		bool getColorFormatParameters(ECOLOR_FORMAT format, GLint& internalFormat, GLenum& pixelFormat,
-			GLenum& pixelType, void(**converter)(const void*, s32, void*)) const;
+			GLenum& pixelType, void(**converter)(const void*, u32, void*)) const;
 
 		//! Return info about fixed pipeline state.
 		E_OPENGL_FIXED_PIPELINE_STATE getFixedPipelineState() const;