diff --git a/a1/program.c b/a1/program.c
index 9bb6048..6afe89f 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -20,7 +20,7 @@ int main()
         vstup = getchar();
         vysChar = vstup;
 
-        if (vstup == -1) { break;} //ak EOF (End Of File), resp. koniec suboru
+        if (vstup == EOF) { break;} //ak EOF (End Of File), resp. koniec suboru
 
         if (vstup == '\n')  // ak NewLine char, resp. koniec riadku
         { 
diff --git a/du1/program.c b/du1/program.c
index 9df691b..1375958 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -20,7 +20,7 @@ int main()
         vstup = getchar();
         vysChar = vstup;
 
-        if (vstup == -1) { break;} //ak EOF (End Of File), resp. koniec suboru
+        if (vstup == EOF) { break;} //ak EOF (End Of File), resp. koniec suboru
 
         if (vstup == '\n')  // ak NewLine char, resp. koniec riadku
         {