diff --git a/changes/ticket25994 b/changes/ticket25994
new file mode 100644
index 0000000000..135417401f
--- /dev/null
+++ b/changes/ticket25994
@@ -0,0 +1,5 @@
+  o Minor bugfixes (tests):
+    - Change the behavior of the "channel/outbound" test so that it never
+      causes a 10-second rollover for the EWMA circuitmux code. Previously,
+      this behavior would happen randomly, and result in fluctuating test
+      coverage. Fixes bug 25994; bugfix on 0.3.3.1-alpha.
diff --git a/src/test/test_channel.c b/src/test/test_channel.c
index 7d5018ef5b..b20063c85e 100644
--- a/src/test/test_channel.c
+++ b/src/test/test_channel.c
@@ -544,6 +544,11 @@ test_channel_outbound_cell(void *arg)
 
   (void) arg;
 
+  /* Set the test time to be mocked, since this test assumes that no
+   * time will pass, ewma values will not need to be re-scaled, and so on */
+  monotime_enable_test_mocking();
+  monotime_set_mock_time_nsec(U64_LITERAL(1000000000) * 12345);
+
   cmux_ewma_set_options(NULL,NULL);
 
   /* The channel will be freed so we need to hijack this so the scheduler
@@ -660,6 +665,7 @@ test_channel_outbound_cell(void *arg)
   tor_free(p_cell);
   channel_free_all();
   UNMOCK(scheduler_release_channel);
+  monotime_disable_test_mocking();
 }
 
 /* Test inbound cell. The callstack is: