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diff --git a/magick/fx.c b/magick/fx.c
index e1c60243cb2d1ddd694599253970926c613b1bf0..6f9cdfc0c2d3eb6a5741197130ce6c8f60eda87b 100644 (file)
--- a/magick/fx.c
+++ b/magick/fx.c
@@ -2280,7 +2280,9 @@ static MagickRealType FxEvaluateSubexpression(FxInfo *fx_info,
             exception);
           if (alpha == 0.0)
             return((MagickRealType) (MagickPI/4.0));
-          return((MagickRealType) j1((double) (MagickPI*alpha))/(2.0*alpha));
+          gamma=(MagickRealType) (j1((double) (MagickPI*alpha))/
+            (MagickPI*alpha));
+          return(gamma);
         }
       break;
     }