diff --git a/legendary/core.py b/legendary/core.py
index a75d3e0..3662dd5 100644
--- a/legendary/core.py
+++ b/legendary/core.py
@@ -662,6 +662,7 @@ class LegendaryCore:
                          ) -> (DLManager, AnalysisResult, ManifestMeta):
         # load old manifest
         old_manifest = None
+        delta_manifest_used = False
 
         # load old manifest if we have one
         if override_old_manifest:
@@ -711,6 +712,7 @@ class LegendaryCore:
                               f'"{old_manifest.meta.build_id}" to'
                               f'"{new_manifest.meta.build_id}"...')
                 new_manifest = delta_manifest
+                delta_manifest_used = True
             else:
                 self.log.debug(f'No Delta manifest received from CDN.')
 
@@ -782,7 +784,8 @@ class LegendaryCore:
                                   file_prefix_filter=file_prefix_filter,
                                   file_exclude_filter=file_exclude_filter,
                                   file_install_tag=file_install_tag,
-                                  processing_optimization=process_opt)
+                                  processing_optimization=process_opt,
+                                  delta_manifest_used=delta_manifest_used)
 
         prereq = None
         if new_manifest.meta.prereq_ids:
diff --git a/legendary/downloader/manager.py b/legendary/downloader/manager.py
index 772aa02..60293a0 100644
--- a/legendary/downloader/manager.py
+++ b/legendary/downloader/manager.py
@@ -79,7 +79,7 @@ class DLManager(Process):
     def run_analysis(self, manifest: Manifest, old_manifest: Manifest = None,
                      patch=True, resume=True, file_prefix_filter=None,
                      file_exclude_filter=None, file_install_tag=None,
-                     processing_optimization=False) -> AnalysisResult:
+                     processing_optimization=False, delta_manifest_used=False) -> AnalysisResult:
         """
         Run analysis on manifest and old manifest (if not None) and return a result
         with a summary resources required in order to install the provided manifest.
@@ -92,6 +92,7 @@ class DLManager(Process):
         :param file_exclude_filter: Exclude files with this prefix from download
         :param file_install_tag: Only install files with the specified tag
         :param processing_optimization: Attempt to optimize processing order and RAM usage
+        :param delta_manifest_used: whether or not the manifest is a delta manifest
         :return: AnalysisResult
         """
 
@@ -181,6 +182,10 @@ class DLManager(Process):
             analysis_res.install_size = sum(fm.file_size for fm in manifest.file_manifest_list.elements
                                             if fm.filename in mc.added)
 
+        # todo properly handle delta manifests
+        if delta_manifest_used:
+            mc.removed = set()
+
         if mc.removed:
             analysis_res.removed = len(mc.removed)
             self.log.debug(f'{analysis_res.removed} removed files')