diff --git a/prefab/packet_parsers/ipv4_packet.c b/prefab/packet_parsers/ipv4_packet.c
index 0cd9f9f..ab76d68 100644
--- a/prefab/packet_parsers/ipv4_packet.c
+++ b/prefab/packet_parsers/ipv4_packet.c
@@ -77,11 +77,11 @@ void insert_ipv4_header(uint8_t *hdr, const PcktHeaderElement *headers) {
     FILL_ADVANCE(hdr, &ipProps->DSF, 1);
     FILL_WORD_H2N_ADVANCE(hdr, ipProps->TotalLength);
     FILL_WORD_H2N_ADVANCE(hdr, ipProps->Identification);
-    uint16_t flags_fragOffset = ((ipProps->Flags & 0x07) << 13) | (flags_fragOffset & ~(0x07 << 13));
+    uint16_t flags_fragOffset = ((ipProps->Flags & 0x07) << 13) | (ipProps->FragmentOffset & ~(0x07 << 13));
     FILL_ADVANCE(hdr, &ipProps->TTL, 1);
     FILL_ADVANCE(hdr, &ipProps->Protocol, 1);
     uint16_t checksum = ip_checksum(ipProps);
     FILL_WORD_H2N_ADVANCE(hdr, checksum);
     FILL_ADVANCE(hdr, &ipProps->SourceIPAddr, 4);
     FILL_ADVANCE(hdr, &ipProps->DestIPAddr, 4);
-}
\ No newline at end of file
+}
diff --git a/utils.h b/utils.h
index 7bee598..88381aa 100644
--- a/utils.h
+++ b/utils.h
@@ -31,9 +31,8 @@
 #define ntohs(a)    htons((a))
 #endif
 
-#define ERROR(...) printf(__VA_ARGS__)
-#define INFO(...) printf(__VA_ARGS__)
-#define MSG(...) printf(__VA_ARGS__)
+#define ERROR(...) MSG(__VA_ARGS__)
+#define INFO(...) MSG(__VA_ARGS__)
 
 #define IPv4(a,b,c,d) ((a) | (b << 8) | (c << 16) | (d << 24))
 #define PRINT_IPv4(ip) MSG("%u.%u.%u.%u", (ip & 0xFF), ((ip >> 8) & 0xFF), ((ip >> 16) & 0xFF), ((ip >> 24) & 0xFF))