diff --git a/du3/program.c b/du3/program.c
index a7f0554..68bab7c 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -14,7 +14,7 @@ const char* evaluate_expression(char *expression){
         case '+': computed_result = num1 + num2; break;
         case '-': computed_result = num1 - num2; break;
         case '*': computed_result = num1 * num2; break;
-        case '/': if (num2 == 0) return "CHYBA"; computed_result = num1 / num2; break;
+        case '/': if (num2 == 0) return "ZLE"; computed_result = num1 / num2; break;
         default: return "CHYBA";
     }