diff --git a/toolkit/locales/en-US/chrome/mozapps/downloads/unknownContentType.properties b/toolkit/locales/en-US/chrome/mozapps/downloads/unknownContentType.properties
index 6dc7b82938b..f0aa26851ec 100644
--- a/toolkit/locales/en-US/chrome/mozapps/downloads/unknownContentType.properties
+++ b/toolkit/locales/en-US/chrome/mozapps/downloads/unknownContentType.properties
@@ -50,8 +50,8 @@ selectDownloadDir=Select Download Folder
 unknownAccept.label=Save File
 unknownCancel.label=Cancel
 fileType=%S file
-# LOCALIZATION NOTE (fileSizeWithType): first %S is type, second %S is size, and third %S is unit  
-fileSizeWithType=%1S (%2S %3S)
+# LOCALIZATION NOTE (orderedFileSizeWithType): first %S is type, second %S is size, and third %S is unit  
+orderedFileSizeWithType=%1$S (%2$S %3$S)
 
 # LOCALIZATION NOTE (wpsDefaultOS2): OS/2 only, WPS refers to the Workplace Shell and should probably not be translated
 wpsDefaultOS2=WPS Default
diff --git a/toolkit/mozapps/downloads/nsHelperAppDlg.js b/toolkit/mozapps/downloads/nsHelperAppDlg.js
index d88b1208d72..62be13dd997 100644
--- a/toolkit/mozapps/downloads/nsHelperAppDlg.js
+++ b/toolkit/mozapps/downloads/nsHelperAppDlg.js
@@ -616,7 +616,7 @@ nsUnknownContentTypeDialog.prototype = {
       let [size, unit] = DownloadUtils.
                          convertByteUnits(this.mLauncher.contentLength);
       type.value = this.dialogElement("strings")
-                       .getFormattedString("fileSizeWithType", 
+                       .getFormattedString("orderedFileSizeWithType", 
                                            [typeString, size, unit]);
     }
     else {