diff --git a/tst/p.psm1 b/tst/p.psm1
index 2d4af132b..96014cbd4 100644
--- a/tst/p.psm1
+++ b/tst/p.psm1
@@ -104,7 +104,7 @@ function t {
     )
 
     if (-not $script:discovery) {
-        if (-not $script:filter -or $script:filter -like "*$name") {
+        if (-not $script:filter -or $script:filter -like "*$([System.Management.Automation.WildcardPattern]::Escape($name))") {
             try {
                 $script:total++
                 $null = & $ScriptBlock