diff --git a/des.c b/des.c
index ada929c..04285c8 100644
--- a/des.c
+++ b/des.c
@@ -150,8 +150,11 @@ void generate_sub_keys(unsigned char* main_key, key_set* key_sets) {
 	int shift_size;
 	unsigned char shift_byte, first_shift_bits, second_shift_bits, third_shift_bits, fourth_shift_bits;
 
-	for (i=0; i<8; i++) {
-		key_sets[0].k[i] = 0;
+	for (i = 1; i < 17; i++) {
+    // Initialize the round subkey to 0 before filling it
+    	for (int x = 0; x < 8; x++) {
+       		key_sets[i].k[x] = 0;
+    	}
 	}
 
 	for (i=0; i<56; i++) {