diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c3189b..f8c91d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ Setup:
 
 * A swap file is now created if system memory is less than 2GB, 5GB of free disk space is available, and if no swap file yet exists.
 * Setup dialogs did not appear correctly when connecting to SSH using Putty on Windows.
+* We now install Roundcube from our own mirror because Sourceforge's downloads experience frequent intermittant unavailability.
 
 v0.17b (March 1, 2016)
 ----------------------
diff --git a/setup/webmail.sh b/setup/webmail.sh
index 2bef9f9..58faad5 100755
--- a/setup/webmail.sh
+++ b/setup/webmail.sh
@@ -51,7 +51,7 @@ fi
 if [ $needs_update == 1 ]; then
 	# install roundcube
 	wget_verify \
-		https://downloads.sourceforge.net/project/roundcubemail/roundcubemail/$VERSION/roundcubemail-$VERSION.tar.gz \
+		https://s3.amazonaws.com/joshdata/mail-in-a-box/public/roundcubemail-$VERSION.tar.gz \
 		$HASH \
 		/tmp/roundcube.tgz
 	tar -C /usr/local/lib --no-same-owner -zxf /tmp/roundcube.tgz