diff --git a/src/openrct2/management/Research.cpp b/src/openrct2/management/Research.cpp
index 2ae1c07393..54010f9d4c 100644
--- a/src/openrct2/management/Research.cpp
+++ b/src/openrct2/management/Research.cpp
@@ -1015,3 +1015,18 @@ bool research_item_is_always_researched(rct_research_item * researchItem)
 {
     return (researchItem->flags & (RESEARCH_ENTRY_FLAG_RIDE_ALWAYS_RESEARCHED | RESEARCH_ENTRY_FLAG_SCENERY_SET_ALWAYS_RESEARCHED)) != 0;
 }
+
+bool rct_research_item::IsInventedEndMarker() const
+{
+    return rawValue == RESEARCHED_ITEMS_SEPARATOR;
+}
+
+bool rct_research_item::IsUninventedEndMarker() const
+{
+    return rawValue == RESEARCHED_ITEMS_END;
+}
+
+bool rct_research_item::IsRandomEndMarker() const
+{
+    return rawValue == RESEARCHED_ITEMS_END_2;
+}
diff --git a/src/openrct2/management/Research.h b/src/openrct2/management/Research.h
index 27bf4c9752..d31a3b0a2e 100644
--- a/src/openrct2/management/Research.h
+++ b/src/openrct2/management/Research.h
@@ -38,6 +38,10 @@ struct rct_research_item
         };
     };
     uint8 category;
+
+    bool IsInventedEndMarker() const;
+    bool IsRandomEndMarker() const;
+    bool IsUninventedEndMarker() const;
 };
 assert_struct_size(rct_research_item, 5);
 #pragma pack(pop)
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index 67c2fcedd8..bdf9d53e1a 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -2123,7 +2123,7 @@ private:
         gResearchExpectedMonth = _s4.next_research_expected_month;
 
         ConvertResearchEntry(&gResearchNextItem, _s4.next_research_item, _s4.next_research_type);
-        if (gResearchNextItem.rawValue == RESEARCHED_ITEMS_SEPARATOR)
+        if (gResearchNextItem.IsInventedEndMarker())
         {
             gResearchProgressStage     = RESEARCH_STAGE_INITIAL_RESEARCH;
             gResearchProgress          = 0;