diff --git a/qubes/api/admin.py b/qubes/api/admin.py
index 7a1a66e6..f200da9c 100644
--- a/qubes/api/admin.py
+++ b/qubes/api/admin.py
@@ -1051,6 +1051,10 @@ class QubesAdminAPI(qubes.api.AbstractQubesAPI):
 
         if not self.dest.is_halted():
             raise qubes.exc.QubesVMNotHaltedError(self.dest)
+            
+        if self.dest.installed_by_rpm:
+            raise qubes.exc.QubesVMInUseError(self.dest, \
+                "VM installed by package manager: " + self.dest.name)
 
         del self.app.domains[self.dest]
         try: