diff --git a/tools/osx/executable_loader.in b/tools/osx/executable_loader.in
index c36695d9e..b6025fe59 100644
--- a/tools/osx/executable_loader.in
+++ b/tools/osx/executable_loader.in
@@ -48,4 +48,7 @@ esac
 #fi
 #ln -sf "${app}" /tmp
 
+AppleLocale=`defaults read -g AppleLocale`
+export LANG=${AppleLocale%@*}.UTF-8
+
 exec "${cwd}/rawtherapee-bin" "$@"