diff --git a/lib/octicons_gem/lib/octicons/octicon.rb b/lib/octicons_gem/lib/octicons/octicon.rb
index 62a53f474..7de596ec8 100644
--- a/lib/octicons_gem/lib/octicons/octicon.rb
+++ b/lib/octicons_gem/lib/octicons/octicon.rb
@@ -11,7 +11,7 @@ def initialize(symbol, options = {})
         @width = octicon["width"]
         @height = octicon["height"]
         @keywords = octicon["keywords"]
-        @options = options
+        @options = options.dup
         @options.merge!({
           class:   classes,
           viewBox: viewbox,