diff --git a/du3/program.c b/du3/program.c
index c4062c8..3d15686 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -135,11 +135,11 @@ int main()
             //** konecna faza = vypisovanie vysledkov
 
             //ak systematicka chyba
-            if (isLineInvalid = true || op1 == 'N' || IsArithCorrect(num1, num2, op1, resultNum) == -1)
+            if (isLineInvalid = true || op1 == 'N' || IsArithCorrect(num1, num2, &op1, resultNum) == -1)
             {
                 printf("CHYBA\n");
             }
-            else if (IsArithCorrect(num1, num2, op1, resultNum) == 0)
+            else if (IsArithCorrect(num1, num2, &op1, resultNum) == 0)
             {
                 printf("ZLE\n");
             }