diff --git a/rtengine/expo_before_b.cc b/rtengine/expo_before_b.cc
index 98fed04f7..f94b2c292 100644
--- a/rtengine/expo_before_b.cc
+++ b/rtengine/expo_before_b.cc
@@ -80,7 +80,7 @@ void RawImageSource::processRawWhitepoint(float expos, float preser, array2D<flo
         if (ri->getSensorType() == ST_BAYER || ri->getSensorType() == ST_FUJI_XTRANS) {
             // Demosaic to allow calculation of luminosity.
             if(ri->getSensorType() == ST_BAYER) {
-                fast_demosaic (0, 0, W, H);
+                fast_demosaic();
             } else {
                 fast_xtrans_interpolate();
             }
diff --git a/rtengine/fast_demo.cc b/rtengine/fast_demo.cc
index 12286d9f1..6143d172e 100644
--- a/rtengine/fast_demo.cc
+++ b/rtengine/fast_demo.cc
@@ -52,7 +52,7 @@ LUTf RawImageSource::initInvGrad()
 #endif
 //LUTf RawImageSource::invGrad = RawImageSource::initInvGrad();
 
-SSEFUNCTION void RawImageSource::fast_demosaic(int winx, int winy, int winw, int winh)
+SSEFUNCTION void RawImageSource::fast_demosaic()
 {
 
     double progress = 0.0;
diff --git a/rtengine/rawimagesource.cc b/rtengine/rawimagesource.cc
index 78fa1f829..5eb7aa7b9 100644
--- a/rtengine/rawimagesource.cc
+++ b/rtengine/rawimagesource.cc
@@ -2046,7 +2046,7 @@ void RawImageSource::demosaic(const RAWParams &raw)
         } else if (raw.bayersensor.method == RAWParams::BayerSensor::methodstring[RAWParams::BayerSensor::lmmse]) {
             lmmse_interpolate_omp(W, H, rawData, red, green, blue, raw.bayersensor.lmmse_iterations);
         } else if (raw.bayersensor.method == RAWParams::BayerSensor::methodstring[RAWParams::BayerSensor::fast] ) {
-            fast_demosaic (0, 0, W, H);
+            fast_demosaic();
         } else if (raw.bayersensor.method == RAWParams::BayerSensor::methodstring[RAWParams::BayerSensor::mono] ) {
             nodemosaic(true);
         } else {
diff --git a/rtengine/rawimagesource.h b/rtengine/rawimagesource.h
index 9da7d44f4..d2ce77fed 100644
--- a/rtengine/rawimagesource.h
+++ b/rtengine/rawimagesource.h
@@ -245,7 +245,7 @@ protected:
     void igv_interpolate(int winw, int winh);
     void lmmse_interpolate_omp(int winw, int winh, array2D<float> &rawData, array2D<float> &red, array2D<float> &green, array2D<float> &blue, int iterations);
     void amaze_demosaic_RT(int winx, int winy, int winw, int winh, array2D<float> &rawData, array2D<float> &red, array2D<float> &green, array2D<float> &blue);//Emil's code for AMaZE
-    void fast_demosaic(int winx, int winy, int winw, int winh );//Emil's code for fast demosaicing
+    void fast_demosaic();//Emil's code for fast demosaicing
     void dcb_demosaic(int iterations, bool dcb_enhance);
     void ahd_demosaic();
     void border_interpolate(unsigned int border, float (*image)[4], unsigned int start = 0, unsigned int end = 0);