diff --git a/mac/macmisc.c b/mac/macmisc.c
index ce32eb44..a1a88f5a 100644
--- a/mac/macmisc.c
+++ b/mac/macmisc.c
@@ -194,7 +194,7 @@ struct tm ltime(void)
     return tm;
 }
 
-const char platform_x11_best_transport[] = "localhost";
+const int platform_uses_x11_unix_by_default = FALSE;
 
 char *platform_get_x_display(void) {
     return NULL;
diff --git a/macosx/osxmain.m b/macosx/osxmain.m
index 362f92bd..d8202e24 100644
--- a/macosx/osxmain.m
+++ b/macosx/osxmain.m
@@ -20,8 +20,6 @@ AppController *controller;
  * and Unix PuTTY code.
  */
 
-const char platform_x11_best_transport[] = "unix";
-
 char *platform_get_x_display(void) {
     return NULL;
 }
diff --git a/unix/uxcons.c b/unix/uxcons.c
index 16e69fbb..f147b35b 100644
--- a/unix/uxcons.c
+++ b/unix/uxcons.c
@@ -416,8 +416,6 @@ int is_interactive(void)
  * X11-forwarding-related things suitable for console.
  */
 
-const char platform_x11_best_transport[] = "unix";
-
 char *platform_get_x_display(void) {
     return dupstr(getenv("DISPLAY"));
 }
diff --git a/unix/uxputty.c b/unix/uxputty.c
index 65b1ecaa..73e11973 100644
--- a/unix/uxputty.c
+++ b/unix/uxputty.c
@@ -115,8 +115,6 @@ char *make_default_wintitle(char *hostname)
  * X11-forwarding-related things suitable for Gtk app.
  */
 
-const char platform_x11_best_transport[] = "unix";
-
 char *platform_get_x_display(void) {
     const char *display;
     /* Try to take account of --display and what have you. */