diff --git a/src/network/slirp/ip.h b/src/network/slirp/ip.h
index 39e3a40da..fba3defa1 100644
--- a/src/network/slirp/ip.h
+++ b/src/network/slirp/ip.h
@@ -71,6 +71,9 @@ typedef uint32_t n_long; /* long as received from the net */
 /*
  * Structure of an internet header, naked of options.
  */
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(push, 1)
+#endif
 struct ip {
 #if G_BYTE_ORDER == G_BIG_ENDIAN
     uint8_t ip_v : 4, /* version */
@@ -91,6 +94,9 @@ struct ip {
     uint16_t ip_sum; /* checksum */
     struct in_addr ip_src, ip_dst; /* source and dest address */
 } SLIRP_PACKED;
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(pop)
+#endif
 
 #define IP_MAXPACKET 65535 /* maximum packet size */
 
@@ -134,6 +140,9 @@ struct ip {
 /*
  * Time stamp option structure.
  */
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(push, 1)
+#endif
 struct ip_timestamp {
     uint8_t ipt_code; /* IPOPT_TS */
     uint8_t ipt_len; /* size of structure (variable) */
@@ -153,6 +162,9 @@ struct ip_timestamp {
         } ipt_ta[1];
     } ipt_timestamp;
 } SLIRP_PACKED;
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(pop)
+#endif
 
 /* flag bits for ipt_flg */
 #define IPOPT_TS_TSONLY 0 /* timestamps only */
@@ -178,6 +190,9 @@ struct ip_timestamp {
 
 #define IP_MSS 576 /* default maximum segment size */
 
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(push, 1)
+#endif
 #if GLIB_SIZEOF_VOID_P == 4
 struct mbuf_ptr {
     struct mbuf *mptr;
@@ -188,6 +203,9 @@ struct mbuf_ptr {
     struct mbuf *mptr;
 } SLIRP_PACKED;
 #endif
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(pop)
+#endif
 struct qlink {
     void *next, *prev;
 };
@@ -195,6 +213,9 @@ struct qlink {
 /*
  * Overlay for ip header used by other protocols (tcp, udp).
  */
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(push, 1)
+#endif
 struct ipovly {
     struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */
     uint8_t ih_x1; /* (unused) */
@@ -203,6 +224,9 @@ struct ipovly {
     struct in_addr ih_src; /* source internet address */
     struct in_addr ih_dst; /* destination internet address */
 } SLIRP_PACKED;
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(pop)
+#endif
 
 /*
  * Ip reassembly queue structure.  Each fragment
diff --git a/src/network/slirp/ip6_icmp.h b/src/network/slirp/ip6_icmp.h
index c37e60f28..77772a76b 100644
--- a/src/network/slirp/ip6_icmp.h
+++ b/src/network/slirp/ip6_icmp.h
@@ -115,6 +115,9 @@ G_STATIC_ASSERT(sizeof(struct icmp6) == 40);
 /*
  * NDP Options
  */
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(push, 1)
+#endif
 struct ndpopt {
     uint8_t ndpopt_type; /* Option type */
     uint8_t ndpopt_len; /* /!\ In units of 8 octets */
@@ -142,6 +145,9 @@ struct ndpopt {
 #define ndpopt_rdnss ndpopt_body.rdnss
     } ndpopt_body;
 } SLIRP_PACKED;
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(pop)
+#endif
 
 /* NDP options type */
 #define NDPOPT_LINKLAYER_SOURCE 1 /* Source Link-Layer Address */
diff --git a/src/network/slirp/slirp.h b/src/network/slirp/slirp.h
index 4f8b13338..d996b53ed 100644
--- a/src/network/slirp/slirp.h
+++ b/src/network/slirp/slirp.h
@@ -75,6 +75,9 @@ struct ethhdr {
     unsigned short h_proto; /* packet type ID field */
 };
 
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(push, 1)
+#endif
 struct slirp_arphdr {
     unsigned short ar_hrd; /* format of hardware address */
     unsigned short ar_pro; /* format of protocol address */
@@ -90,6 +93,9 @@ struct slirp_arphdr {
     unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
     uint32_t ar_tip; /* target IP address       */
 } SLIRP_PACKED;
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(pop)
+#endif
 
 #define ARP_TABLE_SIZE 16
 
diff --git a/src/network/slirp/tftp.h b/src/network/slirp/tftp.h
index 6d75478e8..663485328 100644
--- a/src/network/slirp/tftp.h
+++ b/src/network/slirp/tftp.h
@@ -20,6 +20,9 @@
 #define TFTP_FILENAME_MAX 512
 #define TFTP_BLOCKSIZE_MAX 1428
 
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(push, 1)
+#endif
 struct tftp_t {
     struct udphdr udp;
     uint16_t tp_op;
@@ -35,6 +38,9 @@ struct tftp_t {
         char tp_buf[TFTP_BLOCKSIZE_MAX + 2];
     } x;
 } SLIRP_PACKED;
+#if defined(_MSC_VER) && !defined (__clang__)
+#pragma pack(pop)
+#endif
 
 struct tftp_session {
     Slirp *slirp;
diff --git a/src/network/slirp/util.h b/src/network/slirp/util.h
index d4d8d109d..317b7d849 100644
--- a/src/network/slirp/util.h
+++ b/src/network/slirp/util.h
@@ -46,8 +46,10 @@
 #include <netinet/in.h>
 #endif
 
-#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__))
-#define SLIRP_PACKED __attribute__((gcc_struct, packed))
+#if defined(_MSC_VER) && !defined(__clang__)
+#define SLIRP_PACKED
+#elif defined(_WIN32) && (defined(__x86_64__) || defined(__i386__))
+#define SLIRP_PACKED  __attribute__((gcc_struct, packed))
 #else
 #define SLIRP_PACKED __attribute__((packed))
 #endif