diff --git a/ext/mimemagic/Rakefile b/ext/mimemagic/Rakefile
index 1e1bc2f..5cf21ad 100644
--- a/ext/mimemagic/Rakefile
+++ b/ext/mimemagic/Rakefile
@@ -43,7 +43,7 @@ task :default do
   mkdir_p target_dir
 
   open("#{target_dir}/path.rb", "w") do |f|
-    f.print(<<~SOURCE
+    f.print(<<-SOURCE
       class MimeMagic
         DATABASE_PATH="#{mime_database_path}"
       end