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diff --git a/MagickCore/effect.c b/MagickCore/effect.c
index 176b4631811d314fe5409b245e0f9faa1e2ae4d0..d5895738d1f1b4130c7a445dd4edac3c6386395b 100644 (file)
--- a/MagickCore/effect.c
+++ b/MagickCore/effect.c
@@ -1125,7 +1125,7 @@ MagickExport Image *CannyEdgeImage(const Image *image,const double radius,
         }
         kernel_pixels+=edge_image->columns+1;
       }
-      pixel.magnitude=sqrt(dx*dx+dy*dy);
+      pixel.magnitude=hypot(dx,dy);
       pixel.orientation=0;
       if (fabs(dx) > MagickEpsilon)
         {