diff --git a/lib/puppet/pops/evaluator/runtime3_support.rb b/lib/puppet/pops/evaluator/runtime3_support.rb
index 5227f056156..cc92cb247eb 100644
--- a/lib/puppet/pops/evaluator/runtime3_support.rb
+++ b/lib/puppet/pops/evaluator/runtime3_support.rb
@@ -460,12 +460,6 @@ def is_true?(value, o)
     end
   end
 
-  # Utility method for TrueClass || FalseClass
-  # @param x [Object] the object to test if it is instance of TrueClass or FalseClass
-  def is_boolean? x
-    x.is_a?(TrueClass) || x.is_a?(FalseClass)
-  end
-
   def extract_file_line(o)
     o.is_a?(Model::Positioned) ? [o.file, o.line] : [nil, -1]
   end