diff --git a/du3/program.c b/du3/program.c
index 849ad63..9fa6539 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -83,8 +83,8 @@ int main() {
         else if (or == '-') cislo = a - b;
         else if (or == '*') cislo = a * b;
         else {
-            if (b == 0) {
-                printf("CHYBA\n");
+            if (fabs(b) < 0.000001) {
+                printf("ZLE\n");
                 continue;
             }
             cislo = a / b;