diff --git a/include/net/tap.h b/include/net/tap.h
index a3490a96ab..6daeb42b0f 100644
--- a/include/net/tap.h
+++ b/include/net/tap.h
@@ -29,12 +29,6 @@
 #include "qemu-common.h"
 #include "qapi-types.h"
 
-bool tap_has_ufo(NetClientState *nc);
-bool tap_has_vnet_hdr(NetClientState *nc);
-bool tap_has_vnet_hdr_len(NetClientState *nc, int len);
-void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr);
-void tap_set_offload(NetClientState *nc, int csum, int tso4, int tso6, int ecn, int ufo);
-void tap_set_vnet_hdr_len(NetClientState *nc, int len);
 int tap_enable(NetClientState *nc);
 int tap_disable(NetClientState *nc);
 
diff --git a/net/tap-win32.c b/net/tap-win32.c
index 924ca55bd4..8aee611f7d 100644
--- a/net/tap-win32.c
+++ b/net/tap-win32.c
@@ -669,12 +669,12 @@ static void tap_win32_send(void *opaque)
     }
 }
 
-bool tap_has_ufo(NetClientState *nc)
+static bool tap_has_ufo(NetClientState *nc)
 {
     return false;
 }
 
-bool tap_has_vnet_hdr(NetClientState *nc)
+static bool tap_has_vnet_hdr(NetClientState *nc)
 {
     return false;
 }
@@ -688,11 +688,11 @@ void tap_fd_set_vnet_hdr_len(int fd, int len)
 {
 }
 
-void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
+static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
 {
 }
 
-void tap_set_offload(NetClientState *nc, int csum, int tso4,
+static void tap_set_offload(NetClientState *nc, int csum, int tso4,
                      int tso6, int ecn, int ufo)
 {
 }
@@ -702,12 +702,12 @@ struct vhost_net *tap_get_vhost_net(NetClientState *nc)
     return NULL;
 }
 
-bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
+static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
 {
     return false;
 }
 
-void tap_set_vnet_hdr_len(NetClientState *nc, int len)
+static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
 {
     abort();
 }
diff --git a/net/tap.c b/net/tap.c
index d34ec8802a..2d5099b9be 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -210,7 +210,7 @@ static void tap_send(void *opaque)
     } while (size > 0 && qemu_can_send_packet(&s->nc));
 }
 
-bool tap_has_ufo(NetClientState *nc)
+static bool tap_has_ufo(NetClientState *nc)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
 
@@ -219,7 +219,7 @@ bool tap_has_ufo(NetClientState *nc)
     return s->has_ufo;
 }
 
-bool tap_has_vnet_hdr(NetClientState *nc)
+static bool tap_has_vnet_hdr(NetClientState *nc)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
 
@@ -228,7 +228,7 @@ bool tap_has_vnet_hdr(NetClientState *nc)
     return !!s->host_vnet_hdr_len;
 }
 
-bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
+static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
 
@@ -237,7 +237,7 @@ bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
     return !!tap_probe_vnet_hdr_len(s->fd, len);
 }
 
-void tap_set_vnet_hdr_len(NetClientState *nc, int len)
+static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
 
@@ -249,7 +249,7 @@ void tap_set_vnet_hdr_len(NetClientState *nc, int len)
     s->host_vnet_hdr_len = len;
 }
 
-void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
+static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
 
@@ -259,7 +259,7 @@ void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
     s->using_vnet_hdr = using_vnet_hdr;
 }
 
-void tap_set_offload(NetClientState *nc, int csum, int tso4,
+static void tap_set_offload(NetClientState *nc, int csum, int tso4,
                      int tso6, int ecn, int ufo)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);