diff --git a/BUILD.sh b/BUILD.sh
index b0c6d27..cb6fb37 100755
--- a/BUILD.sh
+++ b/BUILD.sh
@@ -164,7 +164,7 @@
 
 if [[ $PLATFORM == ub16 ]]; then
     # install the RIFT platform code:
-    sudo apt-get install -y rw.toolchain-rwbase=${PLATFORM_VERSION} \
+    sudo apt-get install -y --allow-downgrades rw.toolchain-rwbase=${PLATFORM_VERSION} \
 	 rw.toolchain-rwtoolchain=${PLATFORM_VERSION} \
 	 rw.core.mgmt-mgmt=${PLATFORM_VERSION} \
 	 rw.core.util-util=${PLATFORM_VERSION} \