diff --git a/mathgl.spec b/mathgl.spec
index 90ca4fa..c019bd2 100644
--- a/mathgl.spec
+++ b/mathgl.spec
@@ -190,7 +190,7 @@ for file in AUTHORS ChangeLog.txt README ; do
     mv $file.new $file
 done
 
-%patch0 -b -p1 .gsl2
+%patch50 -b -p1 .gsl2
 %patch0 -b .no-hdf4-and-hdf5-simultaneously
 %patch1 -b .examples
 %patch2 -b .no_octave