diff --git a/lib/redmine/scm/adapters/abstract_adapter.rb b/lib/redmine/scm/adapters/abstract_adapter.rb
index 429d0f17c..c15965595 100644
--- a/lib/redmine/scm/adapters/abstract_adapter.rb
+++ b/lib/redmine/scm/adapters/abstract_adapter.rb
@@ -260,11 +260,21 @@ module Redmine
         def scm_iconv(to, from, str)
           return nil if str.nil?
           return str if to == from
-          begin
-            Iconv.conv(to, from, str)
-          rescue Iconv::Failure => err
-            logger.error("failed to convert from #{from} to #{to}. #{err}")
-            nil
+          if str.respond_to?(:force_encoding)
+            str.force_encoding(from)
+            begin
+              s = str.encode(to)
+            rescue Exception => e
+              logger.error("failed to convert from #{from} to #{to}. #{err}")
+              nil
+            end
+          else
+            begin
+              Iconv.conv(to, from, str)
+            rescue Iconv::Failure => err
+              logger.error("failed to convert from #{from} to #{to}. #{err}")
+              nil
+            end
           end
         end