diff --git a/tests/support/server.tcl b/tests/support/server.tcl
index 2c2665b6449f41cbc5f5456f154eeab217e960bf..acbfe73cff46b3a63837df7cbd656ca8b5357194 100644
--- a/tests/support/server.tcl
+++ b/tests/support/server.tcl
@@ -38,7 +38,9 @@ proc kill_server config {
             if {[string match {*Darwin*} [exec uname -a]]} {
                 tags {"leaks"} {
                     test "Check for memory leaks (pid $pid)" {
-                        exec leaks $pid
+                        set output {0 leaks}
+                        catch {exec leaks $pid} output
+                        set output
                     } {*0 leaks*}
                 }
             }