diff --git a/lib/rouge/lexers/powershell.rb b/lib/rouge/lexers/powershell.rb
index 1f76892e9b..f87c3846a1 100644
--- a/lib/rouge/lexers/powershell.rb
+++ b/lib/rouge/lexers/powershell.rb
@@ -218,6 +218,7 @@ class Powershell < RegexLexer
           push :parameters unless m[3].nil?
         end
 
+        rule %r/\?/, Name::Function, :parameters
         rule %r/[-+*\/%=!.&|]/, Operator
         rule %r/@\{/, Punctuation, :hasht
         rule %r/@\(/, Punctuation, :array
diff --git a/spec/visual/samples/powershell b/spec/visual/samples/powershell
index d27f754479..ee5567d6c9 100644
--- a/spec/visual/samples/powershell
+++ b/spec/visual/samples/powershell
@@ -199,3 +199,6 @@ $gitExeString = "$gitExeFolder\git.exe" &("$gitExeString") config --add --global
 Get-ChildItem -Include *.txt `
     -Recurse
 Write-Output `$hello
+
+# Where-Object alias
+Get-process | ? {$_.workingset -gt 25000*1024}