diff --git a/run_tests.sh b/run_tests.sh
index 3129599c..93e91dde 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -51,13 +51,10 @@ fi
 # Source distribution information
 source /etc/os-release || source /usr/lib/os-release
 
-# Prefer dnf over yum for CentOS.
-which dnf &>/dev/null && RHT_PKG_MGR='dnf' || RHT_PKG_MGR='yum'
-
 # Figure out the appropriate package install command
 case ${ID,,} in
     *suse*) pkg_mgr_cmd="zypper -n in" ;;
-    centos|rhel|fedora) pkg_mgr_cmd="${RHT_PKG_MGR} install -y" ;;
+    centos|rhel|fedora) pkg_mgr_cmd="dnf install -y" ;;
     ubuntu|debian) pkg_mgr_cmd="apt-get install -y" ;;
     # Gentoo needs to have version set since it's rolling
     gentoo) pkg_mgr_cmd="emerge --jobs=4"; VERSION="rolling" ;;