diff --git a/lib/banzai/filter/syntax_highlight_filter.rb b/lib/banzai/filter/syntax_highlight_filter.rb
index 278d4d92d08..e7f6b715ba8 100644
--- a/lib/banzai/filter/syntax_highlight_filter.rb
+++ b/lib/banzai/filter/syntax_highlight_filter.rb
@@ -1,27 +1,5 @@
 require 'rouge/plugins/redcarpet'
 
-module Rouge
-  module Lexers
-    class Math < Lexer
-      title "Plain Text"
-      desc "A boring lexer that doesn't highlight anything"
-
-      tag 'math'
-      mimetypes 'text/plain'
-
-      default_options :token => 'Text'
-
-      def token
-        @token ||= Token[option :token]
-      end
-
-      def stream_tokens(string, &b)
-        yield self.token, string
-      end
-    end
-  end
-end
-
 module Banzai
   module Filter
     # HTML Filter to highlight fenced code blocks
diff --git a/lib/rouge/lexers/math.rb b/lib/rouge/lexers/math.rb
new file mode 100644
index 00000000000..ae980da8283
--- /dev/null
+++ b/lib/rouge/lexers/math.rb
@@ -0,0 +1,21 @@
+module Rouge
+  module Lexers
+    class Math < Lexer
+      title "Plain Text"
+      desc "A boring lexer that doesn't highlight anything"
+
+      tag 'math'
+      mimetypes 'text/plain'
+
+      default_options :token => 'Text'
+
+      def token
+        @token ||= Token[option :token]
+      end
+
+      def stream_tokens(string, &b)
+        yield self.token, string
+      end
+    end
+  end
+end
\ No newline at end of file