diff --git a/src/Umbraco.Web.UI/config/umbracoSettings.Release.config b/src/Umbraco.Web.UI/config/umbracoSettings.Release.config
index d213e0909e..d70b455d11 100644
--- a/src/Umbraco.Web.UI/config/umbracoSettings.Release.config
+++ b/src/Umbraco.Web.UI/config/umbracoSettings.Release.config
@@ -5,7 +5,7 @@
       <!-- what file extension that should cause umbraco to create thumbnails -->
       <imageFileTypes>jpeg,jpg,gif,bmp,png,tiff,tif</imageFileTypes>
       <!-- what attributes that are allowed in the editor on an img tag -->
-      <allowedAttributes>alt,border,class,style,align,id,name,onclick,usemap</allowedAttributes>
+      <allowedAttributes>src,alt,border,class,style,align,id,name,onclick,usemap</allowedAttributes>
       <!-- automatically updates dimension, filesize and extension attributes on upload -->
       <autoFillImageProperties>
         <uploadField alias="umbracoFile">
diff --git a/src/Umbraco.Web.UI/config/umbracoSettings.config b/src/Umbraco.Web.UI/config/umbracoSettings.config
index 79d8dd0ea9..372777126a 100644
--- a/src/Umbraco.Web.UI/config/umbracoSettings.config
+++ b/src/Umbraco.Web.UI/config/umbracoSettings.config
@@ -5,7 +5,7 @@
             <!-- what file extension that should cause umbraco to create thumbnails -->
             <imageFileTypes>jpeg,jpg,gif,bmp,png,tiff,tif</imageFileTypes>
             <!-- what attributes that are allowed in the editor on an img tag -->
-            <allowedAttributes>alt,border,class,style,align,id,name,onclick,usemap</allowedAttributes>
+            <allowedAttributes>src,alt,border,class,style,align,id,name,onclick,usemap</allowedAttributes>
             <!-- automatically updates dimension, filesize and extension attributes on upload -->
             <autoFillImageProperties>
                 <uploadField alias="umbracoFile">