diff --git a/du3/program.c b/du3/program.c
index 7bb18de..2b95e09 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -22,7 +22,7 @@ int main(){
 	while(stop == 0){
 		r = fgets(riadok,LINE_SIZE,stdin);
 		pos++;
-		if (r == NULL || !isdigit(*r)) {
+		if (r == NULL || !isdigit(*r) || *r == EOF) {
             		//printf("%d", *r);
 			if(*r == 10){
 				stop = 1;