diff --git a/tests/cmdMZ.test b/tests/cmdMZ.test
index 60b1cab56540..7dc04a5a8e87 100644
--- a/tests/cmdMZ.test
+++ b/tests/cmdMZ.test
@@ -24,6 +24,10 @@ namespace eval ::tcl::test::cmdMZ {
     namespace import ::tcltest::temporaryDirectory
     namespace import ::tcltest::test
 
+    if {[namespace which -command ::tcl::unsupported::timerate] ne ""} {
+	namespace import ::tcl::unsupported::timerate
+    }
+
     proc ListGlobMatch {expected actual} {
 	if {[llength $expected] != [llength $actual]} {
 	    return 0