diff --git a/du4/program.c b/du4/program.c
index 9964a3d..84e38e9 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -32,7 +32,6 @@ int main() {
         // Parse second number
         float num2 = strtof(start, &end);
         if (end == start) {
-            printf("CHYBA\n");
             valid = 0;
         }
         start = end;