diff --git a/du3/program.c b/du3/program.c
index 35bb4de..34118fa 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -135,7 +135,7 @@ int main()
             {
                 printf("CHYBA\n");
             }
-            else if (IsArithCorrect(strtof(num1Temp, strtofEndPtr),strtof(num2Temp, strtofEndPtr), op1) == 0)
+            else if (IsArithCorrect(strtof(num1Temp, &strtofEndPtr),strtof(num2Temp, &strtofEndPtr), op1) == 0)
             {
                 printf("ZLE\n");
             }