diff --git a/delta_performer.h b/delta_performer.h
index 8345174..34cb137 100644
--- a/delta_performer.h
+++ b/delta_performer.h
@@ -279,6 +279,8 @@
   // These perform a specific type of operation and return true on success.
   bool PerformReplaceOperation(const InstallOperation& operation,
                                bool is_kernel_partition);
+  bool PerformZeroOrDiscardOperation(const InstallOperation& operation,
+                                     bool is_kernel_partition);
   bool PerformMoveOperation(const InstallOperation& operation,
                             bool is_kernel_partition);
   bool PerformBsdiffOperation(const InstallOperation& operation,