diff --git a/ssh1bpp.c b/ssh1bpp.c
index 702ffb8b..90942587 100644
--- a/ssh1bpp.c
+++ b/ssh1bpp.c
@@ -33,7 +33,7 @@ static void ssh1_bpp_handle_input(BinaryPacketProtocol *bpp);
 static PktOut *ssh1_bpp_new_pktout(int type);
 static void ssh1_bpp_format_packet(BinaryPacketProtocol *bpp, PktOut *pkt);
 
-const struct BinaryPacketProtocolVtable ssh1_bpp_vtable = {
+static const struct BinaryPacketProtocolVtable ssh1_bpp_vtable = {
     ssh1_bpp_free,
     ssh1_bpp_handle_input,
     ssh1_bpp_new_pktout,
diff --git a/ssh2bpp-bare.c b/ssh2bpp-bare.c
index e16c8509..45f757f6 100644
--- a/ssh2bpp-bare.c
+++ b/ssh2bpp-bare.c
@@ -25,7 +25,7 @@ static void ssh2_bare_bpp_handle_input(BinaryPacketProtocol *bpp);
 static PktOut *ssh2_bare_bpp_new_pktout(int type);
 static void ssh2_bare_bpp_format_packet(BinaryPacketProtocol *bpp, PktOut *);
 
-const struct BinaryPacketProtocolVtable ssh2_bare_bpp_vtable = {
+static const struct BinaryPacketProtocolVtable ssh2_bare_bpp_vtable = {
     ssh2_bare_bpp_free,
     ssh2_bare_bpp_handle_input,
     ssh2_bare_bpp_new_pktout,
diff --git a/ssh2bpp.c b/ssh2bpp.c
index 2b7f4654..49ab8cfd 100644
--- a/ssh2bpp.c
+++ b/ssh2bpp.c
@@ -42,7 +42,7 @@ static void ssh2_bpp_handle_input(BinaryPacketProtocol *bpp);
 static PktOut *ssh2_bpp_new_pktout(int type);
 static void ssh2_bpp_format_packet(BinaryPacketProtocol *bpp, PktOut *pkt);
 
-const struct BinaryPacketProtocolVtable ssh2_bpp_vtable = {
+static const struct BinaryPacketProtocolVtable ssh2_bpp_vtable = {
     ssh2_bpp_free,
     ssh2_bpp_handle_input,
     ssh2_bpp_new_pktout,
diff --git a/sshverstring.c b/sshverstring.c
index a9b1e46c..37644276 100644
--- a/sshverstring.c
+++ b/sshverstring.c
@@ -44,7 +44,7 @@ static void ssh_verstring_handle_input(BinaryPacketProtocol *bpp);
 static PktOut *ssh_verstring_new_pktout(int type);
 static void ssh_verstring_format_packet(BinaryPacketProtocol *bpp, PktOut *);
 
-const struct BinaryPacketProtocolVtable ssh_verstring_vtable = {
+static const struct BinaryPacketProtocolVtable ssh_verstring_vtable = {
     ssh_verstring_free,
     ssh_verstring_handle_input,
     ssh_verstring_new_pktout,