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[ginac.git] / ginac / integral.cpp

diff --git a/ginac/integral.cpp b/ginac/integral.cpp
index f9d42a99520d4761ff51a0795873ed69a87aa692..57f3532bc5ffea8991e01357a2a0587571c82bfb 100644 (file)
--- a/ginac/integral.cpp
+++ b/ginac/integral.cpp
@@ -223,7 +223,7 @@ struct error_and_integral
 
 struct error_and_integral_is_less
 {
-       bool operator()(const error_and_integral &e1,const error_and_integral &e2)
+       bool operator()(const error_and_integral &e1,const error_and_integral &e2) const
        {
                int c = e1.integral.compare(e2.integral);
                if(c < 0)