diff --git a/du3/program.c b/du3/program.c
index 707b1b1..ed68372 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -36,7 +36,7 @@ h = mass[j];
 //printf("%d ", h);
 if(j != 0){
 if(counter != 0){
-vysl += h * powl(x,counter);
+vysl += h * powf(x,counter);
 }
 else{
 vysl += h;