diff --git a/extensions/libarchive/MergeContent.h b/extensions/libarchive/MergeContent.h
index a0248eec2b..4995732b83 100644
--- a/extensions/libarchive/MergeContent.h
+++ b/extensions/libarchive/MergeContent.h
@@ -370,7 +370,7 @@ class MergeContent : public processors::BinFiles {
   EXTENSIONAPI static constexpr bool SupportsDynamicProperties = false;
   EXTENSIONAPI static constexpr bool SupportsDynamicRelationships = false;
   EXTENSIONAPI static constexpr core::annotation::Input InputRequirement = core::annotation::Input::INPUT_REQUIRED;
-  EXTENSIONAPI static constexpr bool IsSingleThreaded = false;
+  EXTENSIONAPI static constexpr bool IsSingleThreaded = true;
 
   ADD_COMMON_VIRTUAL_FUNCTIONS_FOR_PROCESSORS