diff --git a/server/tests/test-display-no-ssl.c b/server/tests/test-display-no-ssl.c
index 97673c99..6555623a 100644
--- a/server/tests/test-display-no-ssl.c
+++ b/server/tests/test-display-no-ssl.c
@@ -30,15 +30,10 @@
 SpiceCoreInterface *core;
 SpiceTimer *ping_timer;
 
-void show_channels(SpiceServer *server);
-
 int ping_ms = 100;
 
 static void pinger(SPICE_GNUC_UNUSED void *opaque)
 {
-    // show_channels is not thread safe - fails if disconnections / connections occur
-    //show_channels(server);
-
     core->timer_start(ping_timer, ping_ms);
 }
 
diff --git a/server/tests/test-display-resolution-changes.c b/server/tests/test-display-resolution-changes.c
index 2619a1ca..14036b8c 100644
--- a/server/tests/test-display-resolution-changes.c
+++ b/server/tests/test-display-resolution-changes.c
@@ -26,15 +26,11 @@
 
 SpiceTimer *ping_timer;
 
-void show_channels(SpiceServer *server);
-
 int ping_ms = 100;
 
 static void pinger(void *opaque)
 {
     Test *test = opaque;
-    // show_channels is not thread safe - fails if disconnections / connections occur
-    //show_channels(server);
 
     test->core->timer_start(ping_timer, ping_ms);
 }
diff --git a/server/tests/test-display-width-stride.c b/server/tests/test-display-width-stride.c
index 6bf54f1d..fb4bea48 100644
--- a/server/tests/test-display-width-stride.c
+++ b/server/tests/test-display-width-stride.c
@@ -26,15 +26,11 @@
 
 SpiceTimer *ping_timer;
 
-void show_channels(SpiceServer *server);
-
 int ping_ms = 100;
 
 static void pinger(void *opaque)
 {
     Test *test = opaque;
-    // show_channels is not thread safe - fails if disconnections / connections occur
-    //show_channels(server);
 
     test->core->timer_start(ping_timer, ping_ms);
 }
diff --git a/server/tests/test-vdagent.c b/server/tests/test-vdagent.c
index 232e9824..01308d0d 100644
--- a/server/tests/test-vdagent.c
+++ b/server/tests/test-vdagent.c
@@ -29,11 +29,6 @@
 #include "test-display-base.h"
 #include "test-glib-compat.h"
 
-SpiceCoreInterface *core;
-SpiceTimer *ping_timer;
-
-int ping_ms = 100;
-
 #ifndef MIN
 #define MIN(a, b) ((a) > (b) ? (b) : (a))
 #endif