diff --git a/_imaging.c b/_imaging.c
index 7b3380b40..ff38a19b6 100644
--- a/_imaging.c
+++ b/_imaging.c
@@ -836,7 +836,7 @@ _filter(ImagingObject* self, PyObject* args)
     Py_ssize_t kernelsize;
     FLOAT32* kerneldata;
 
-    int xsize, ysize;
+    int xsize, ysize, i;
     float divisor, offset;
     PyObject* kernel = NULL;
     if (!PyArg_ParseTuple(args, "(ii)ffO", &xsize, &ysize,
@@ -852,8 +852,12 @@ _filter(ImagingObject* self, PyObject* args)
         return ImagingError_ValueError("bad kernel size");
     }
 
+    for (i = 0; i < kernelsize; ++i) {
+        kerneldata[i] /= divisor;
+    }
+
     imOut = PyImagingNew(
-        ImagingFilter(self->image, xsize, ysize, kerneldata, offset, divisor)
+        ImagingFilter(self->image, xsize, ysize, kerneldata, offset)
         );
 
     free(kerneldata);
diff --git a/libImaging/Filter.c b/libImaging/Filter.c
index 4c8b81587..50946c8ce 100644
--- a/libImaging/Filter.c
+++ b/libImaging/Filter.c
@@ -73,7 +73,7 @@ ImagingExpand(Imaging imIn, int xmargin, int ymargin, int mode)
 
 Imaging
 ImagingFilter(Imaging im, int xsize, int ysize, const FLOAT32* kernel,
-              FLOAT32 offset, FLOAT32 divisor)
+              FLOAT32 offset)
 {
     Imaging imOut;
     int x, y;
@@ -138,7 +138,7 @@ ImagingFilter(Imaging im, int xsize, int ysize, const FLOAT32* kernel,
         for (y = 1; y < im->ysize-1; y++) {
             imOut->image[y][0] = im->image8[y][0];
             for (x = 1; x < im->xsize-1; x++) {
-                sum = KERNEL3x3(im->image8, kernel, 1) / divisor + offset;
+                sum = KERNEL3x3(im->image8, kernel, 1) + offset;
                 if (sum <= 0)
                     imOut->image8[y][x] = 0;
                 else if (sum >= 255)
@@ -159,7 +159,7 @@ ImagingFilter(Imaging im, int xsize, int ysize, const FLOAT32* kernel,
             for (x = 0; x < 2; x++)
                 imOut->image8[y][x] = im->image8[y][x];
             for (; x < im->xsize-2; x++) {
-                sum = KERNEL5x5(im->image8, kernel, 1) / divisor + offset;
+                sum = KERNEL5x5(im->image8, kernel, 1) + offset;
                 if (sum <= 0)
                     imOut->image8[y][x] = 0;
                 else if (sum >= 255)
diff --git a/libImaging/Imaging.h b/libImaging/Imaging.h
index 99fff7f67..81dc39c60 100644
--- a/libImaging/Imaging.h
+++ b/libImaging/Imaging.h
@@ -261,7 +261,7 @@ extern Imaging ImagingFillLinearGradient(const char* mode);
 extern Imaging ImagingFillRadialGradient(const char* mode);
 extern Imaging ImagingFilter(
     Imaging im, int xsize, int ysize, const FLOAT32* kernel,
-    FLOAT32 offset, FLOAT32 divisor);
+    FLOAT32 offset);
 extern Imaging ImagingFlipLeftRight(Imaging imOut, Imaging imIn);
 extern Imaging ImagingFlipTopBottom(Imaging imOut, Imaging imIn);
 extern Imaging ImagingGaussianBlur(Imaging imOut, Imaging imIn, float radius,