diff --git a/tests/build_rpms.sh b/tests/build_rpms.sh
index 5657b0f6..ce65921f 100755
--- a/tests/build_rpms.sh
+++ b/tests/build_rpms.sh
@@ -61,7 +61,8 @@ yum -y install \
     rrdtool-devel
 
 if [[ $BUILD_ENV == osg* ]]; then
-    OSG_SERIES="$(cut -d- -f2 <<< "$BUILD_ENV")-main"
+    OSG_SERIES=$(cut -d- -f2 <<< "$BUILD_ENV")
+    OSG_SERIES="${OSG_SERIES}-main"
     yum install -y https://repo.opensciencegrid.org/osg/${OSG_SERIES}/osg-${OSG_SERIES}-el${OS_VERSION}-release-latest.rpm
 else
     # This is currently tracking the 10.x feature release.