diff --git a/lib/paperclip/content_type_detector.rb b/lib/paperclip/content_type_detector.rb
index e0d587458..a1f822bb5 100644
--- a/lib/paperclip/content_type_detector.rb
+++ b/lib/paperclip/content_type_detector.rb
@@ -60,7 +60,7 @@ def calculated_type_matches
     end
 
     def type_from_file_contents
-      certificate_type || type_from_file_command
+      (certificate_type || pkcs8_type || type_from_file_command)
     rescue Errno::ENOENT => e
       Paperclip.log("Error while determining content type: #{e}")
       SENSIBLE_DEFAULT
@@ -76,5 +76,11 @@ def certificate_type
       'application/x-x509-ca-cert'
     rescue StandardError
     end
+    
+    def pkcs8_type
+      key = OpenSSL::PKey.read(File.read(@filename))
+      'application/pkcs8'
+    rescue StandardError
+    end  
   end
 end