diff --git a/lib/ioh-guest b/lib/ioh-guest
index 50bbb32..b9d63b7 100644
--- a/lib/ioh-guest
+++ b/lib/ioh-guest
@@ -319,7 +319,7 @@ __guest_load() {
 		*) local wire_memory="" ;;
 	esac
 	# Check for loader already present as a zombie
-	if [ ! -z $(pgrep -f "ioh-$name") ]; then
+	if [ ! -z $(pgrep -xf "ioh-$name") ]; then
 		echo "This guest appears to be already running/loaded."
 		echo "Use stop, destroy, or forcekill to remove zombie processes."
 		exit 1