diff --git a/lib/redmine/scm/adapters/subversion_adapter.rb b/lib/redmine/scm/adapters/subversion_adapter.rb
index 61cce93b0..7f79fa3cf 100644
--- a/lib/redmine/scm/adapters/subversion_adapter.rb
+++ b/lib/redmine/scm/adapters/subversion_adapter.rb
@@ -37,7 +37,7 @@ module Redmine
             version = nil
             shellout(cmd) do |io|
               # Read svn version in first returned line
-              if m = io.gets.match(%r{((\d+\.)+\d+)})
+              if m = io.gets.to_s.match(%r{((\d+\.)+\d+)})
                 version = m[0].scan(%r{\d+}).collect(&:to_i)
               end
             end