diff --git a/hostinfo/subscription.go b/hostinfo/subscription.go
index 8a132e8..f20096c 100644
--- a/hostinfo/subscription.go
+++ b/hostinfo/subscription.go
@@ -65,7 +65,7 @@ func GetSocketCount(facts SubManValues) (string, error) {
 }
 
 func GetProduct(facts SubManValues) ([]string, error) {
-	output, _ := execSubManCommand("list --installed")
+	output, _ := execSubManCommand("list", "--installed")
 	values := parseSubManOutputMultiVal(output)
 	return values.get("Product ID")
 }
@@ -109,8 +109,8 @@ func GetBillingInfo(facts SubManValues) (BillingInfo, error) {
 	return BillingInfo{}, err
 }
 
-func execSubManCommand(command string) (string, error) {
-	cmd := exec.Command("subscription-manager", command)
+func execSubManCommand(command ...string) (string, error) {
+	cmd := exec.Command("subscription-manager", command...)
 	logger.Debugf("Executing `subscription-manager %s`...\n", command)
 
 	var stdout, stderr bytes.Buffer
diff --git a/mocks/subscription-manager b/mocks/subscription-manager
index 4046f82..a7f78e5 100755
--- a/mocks/subscription-manager
+++ b/mocks/subscription-manager
@@ -215,10 +215,12 @@ hard_coded() {
       show_facts
       ;;
     list)
-      show_list_installed
-      ;;
-    "list --installed")
-      show_list_installed
+      if [ "${2}" == "--installed" ]; then
+        show_list_installed
+      else
+        echo "Unsupported command: ${command}" >&2
+        exit 1
+      fi
       ;;
     *)
       echo "Unsupported command: ${command}" >&2