diff --git a/plugins/storage/image/default/src/org/apache/cloudstack/storage/datastore/driver/CloudStackImageStoreDriverImpl.java b/plugins/storage/image/default/src/org/apache/cloudstack/storage/datastore/driver/CloudStackImageStoreDriverImpl.java
index 177d8d8d36e..31fab32eb7a 100644
--- a/plugins/storage/image/default/src/org/apache/cloudstack/storage/datastore/driver/CloudStackImageStoreDriverImpl.java
+++ b/plugins/storage/image/default/src/org/apache/cloudstack/storage/datastore/driver/CloudStackImageStoreDriverImpl.java
@@ -309,6 +309,12 @@ public class CloudStackImageStoreDriverImpl implements ImageStoreDriver {
                     }
                 }
              }
+        } else{
+            // cannot delete iso due to some VMs are using this
+            s_logger.debug("Cannot delete iso since some user vms are referencing it");
+            CommandResult result = new CommandResult();
+            result.setResult("Cannot delete iso since some user vms are referencing it");
+            callback.complete(result);
         }
 
     }
diff --git a/plugins/storage/image/s3/src/org/apache/cloudstack/storage/datastore/driver/S3ImageStoreDriverImpl.java b/plugins/storage/image/s3/src/org/apache/cloudstack/storage/datastore/driver/S3ImageStoreDriverImpl.java
index 29cafdbb73c..cbf55b66fc6 100644
--- a/plugins/storage/image/s3/src/org/apache/cloudstack/storage/datastore/driver/S3ImageStoreDriverImpl.java
+++ b/plugins/storage/image/s3/src/org/apache/cloudstack/storage/datastore/driver/S3ImageStoreDriverImpl.java
@@ -323,6 +323,12 @@ public class S3ImageStoreDriverImpl implements ImageStoreDriver {
                     }
                 }
             }
+        } else{
+            // cannot delete iso due to some VMs are using this
+            s_logger.debug("Cannot delete iso since some user vms are referencing it");
+            CommandResult result = new CommandResult();
+            result.setResult("Cannot delete iso since some user vms are referencing it");
+            callback.complete(result);
         }
     }
 
diff --git a/plugins/storage/image/swift/src/org/apache/cloudstack/storage/datastore/driver/SwiftImageStoreDriverImpl.java b/plugins/storage/image/swift/src/org/apache/cloudstack/storage/datastore/driver/SwiftImageStoreDriverImpl.java
index db3b225c1ef..003152a309c 100644
--- a/plugins/storage/image/swift/src/org/apache/cloudstack/storage/datastore/driver/SwiftImageStoreDriverImpl.java
+++ b/plugins/storage/image/swift/src/org/apache/cloudstack/storage/datastore/driver/SwiftImageStoreDriverImpl.java
@@ -315,6 +315,12 @@ public class SwiftImageStoreDriverImpl implements ImageStoreDriver {
                     }
                 }
             }
+        } else{
+            // cannot delete iso due to some VMs are using this
+            s_logger.debug("Cannot delete iso since some user vms are referencing it");
+            CommandResult result = new CommandResult();
+            result.setResult("Cannot delete iso since some user vms are referencing it");
+            callback.complete(result);
         }
     }