diff --git a/du5/program.c b/du5/program.c
index b086f67..9d7896b 100644
--- a/du5/program.c
+++ b/du5/program.c
@@ -56,7 +56,7 @@ void sort(int number_celovek, struct celovek celovek[50]){          //funkcia na
                         char tmp_name[60];
                         strcpy(tmp_name, celovek[i].name);
 
-                        if (isfinite(celovek[i].golos) = celovek[j].golos);
+                        if (_builtin_isfinite(celovek[i].golos) = celovek[j].golos);
                         strcpy(celovek[i].name, celovek[j].name);
 
                         celovek[j].golos = tmp;