diff --git a/src/management/research.c b/src/management/research.c
index f50a7f6c24..2544c78d48 100644
--- a/src/management/research.c
+++ b/src/management/research.c
@@ -164,7 +164,7 @@ void research_finish_item(sint32 entryIndex)
 	rct_ride_entry *rideEntry, *rideEntry2;
 	rct_scenery_set_entry *scenerySetEntry;
 
-	RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, sint32) = entryIndex;
+	gResearchLastItemSubject = (uint32)entryIndex;
 	research_invalidate_related_windows();
 	if (entryIndex >= 0x10000) {
 		// Ride
@@ -330,7 +330,7 @@ void sub_684AC3(){
 		research_finish_item(research->entryIndex);
 	}
 
-	RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, sint32) = -1;
+	gResearchLastItemSubject = (uint32)-1;
 	gResearchProgressStage = 0;
 	gResearchProgress = 0;
 }
diff --git a/src/management/research.h b/src/management/research.h
index eb90da2078..595061f489 100644
--- a/src/management/research.h
+++ b/src/management/research.h
@@ -66,6 +66,7 @@ enum {
 #define gResearchPriorities			RCT2_GLOBAL(RCT2_ADDRESS_ACTIVE_RESEARCH_TYPES, uint8)
 #define gResearchProgress			RCT2_GLOBAL(RCT2_ADDRESS_RESEARH_PROGRESS, uint16)
 #define gResearchProgressStage		RCT2_GLOBAL(RCT2_ADDRESS_RESEARH_PROGRESS_STAGE, uint8)
+#define gResearchLastItemSubject	RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, uint32)
 #define gResearchExpectedMonth		RCT2_GLOBAL(RCT2_ADDRESS_NEXT_RESEARCH_EXPECTED_MONTH, uint8)
 #define gResearchExpectedDay		RCT2_GLOBAL(RCT2_ADDRESS_NEXT_RESEARCH_EXPECTED_DAY, uint8)
 #define gResearchNextCategory		RCT2_GLOBAL(RCT2_ADDRESS_NEXT_RESEARCH_CATEGORY, uint8)
diff --git a/src/rct2/S6Exporter.cpp b/src/rct2/S6Exporter.cpp
index 6db7bd215d..3b659cb8da 100644
--- a/src/rct2/S6Exporter.cpp
+++ b/src/rct2/S6Exporter.cpp
@@ -304,7 +304,7 @@ void S6Exporter::Export()
 
     _s6.active_research_types = gResearchPriorities;
     _s6.research_progress_stage = gResearchProgressStage;
-    _s6.last_researched_item_subject = RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, uint32);
+    _s6.last_researched_item_subject = gResearchLastItemSubject;
     // pad_01357CF8
     _s6.next_research_item = gResearchNextItem;
     _s6.research_progress = gResearchProgress;
diff --git a/src/rct2/S6Importer.cpp b/src/rct2/S6Importer.cpp
index 4a884a37e1..2268a8abeb 100644
--- a/src/rct2/S6Importer.cpp
+++ b/src/rct2/S6Importer.cpp
@@ -236,7 +236,7 @@ void S6Importer::Import()
 
     gResearchPriorities = _s6.active_research_types;
     gResearchProgressStage = _s6.research_progress_stage;
-    RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, uint32) = _s6.last_researched_item_subject;
+    gResearchLastItemSubject = _s6.last_researched_item_subject;
     // pad_01357CF8
     gResearchNextItem = _s6.next_research_item;
     gResearchProgress = _s6.research_progress;
diff --git a/src/windows/new_ride.c b/src/windows/new_ride.c
index 30c08b0303..e9305e55ca 100644
--- a/src/windows/new_ride.c
+++ b/src/windows/new_ride.c
@@ -617,7 +617,7 @@ static void window_new_ride_mouseup(rct_window *w, int widgetIndex)
 		window_close(w);
 		break;
 	case WIDX_LAST_DEVELOPMENT_BUTTON:
-		news_item_open_subject(NEWS_ITEM_RESEARCH, RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, sint32));
+		news_item_open_subject(NEWS_ITEM_RESEARCH, (int)gResearchLastItemSubject);
 		break;
 	case WIDX_RESEARCH_FUNDING_BUTTON:
 		window_finances_research_open();
@@ -739,7 +739,7 @@ static void window_new_ride_invalidate(rct_window *w)
 
 	if (_window_new_ride_current_tab == WINDOW_NEW_RIDE_PAGE_RESEARCH) {
 		window_new_ride_widgets[WIDX_LAST_DEVELOPMENT_BUTTON].type = WWT_EMPTY;
-		uint32 typeId = RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, uint32);
+		uint32 typeId = gResearchLastItemSubject;
 		if (typeId != 0xFFFFFFFF) {
 			window_new_ride_widgets[WIDX_LAST_DEVELOPMENT_BUTTON].type = WWT_FLATBTN;
 			window_new_ride_widgets[WIDX_LAST_DEVELOPMENT_BUTTON].image = typeId >= 0x10000 ? 5189 : 5191;
diff --git a/src/windows/research.c b/src/windows/research.c
index 4a9608ee3e..5ef054966c 100644
--- a/src/windows/research.c
+++ b/src/windows/research.c
@@ -266,7 +266,7 @@ static void window_research_development_mouseup(rct_window *w, int widgetIndex)
 		window_research_set_page(w, widgetIndex - WIDX_TAB_1);
 		break;
 	case WIDX_LAST_DEVELOPMENT_BUTTON:
-		news_item_open_subject(NEWS_ITEM_RESEARCH, RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, sint32));
+		news_item_open_subject(NEWS_ITEM_RESEARCH, (int)gResearchLastItemSubject);
 		break;
 	}
 }
@@ -299,7 +299,7 @@ static void window_research_development_invalidate(rct_window *w)
 	window_research_set_pressed_tab(w);
 
 	window_research_development_widgets[WIDX_LAST_DEVELOPMENT_BUTTON].type = WWT_EMPTY;
-	uint32 typeId = RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, uint32);
+	uint32 typeId = gResearchLastItemSubject;
 	if (typeId != 0xFFFFFFFF) {
 		window_research_development_widgets[WIDX_LAST_DEVELOPMENT_BUTTON].type = WWT_FLATBTN;
 		window_research_development_widgets[WIDX_LAST_DEVELOPMENT_BUTTON].image = typeId >= 0x10000 ? 5189 : 5191;
@@ -380,7 +380,7 @@ void window_research_development_page_paint(rct_window *w, rct_drawpixelinfo *dp
 	x = w->x + 10;
 	y = w->y + w->widgets[WIDX_LAST_DEVELOPMENT_GROUP + baseWidgetIndex].top + 12;
 
-	uint32 typeId = RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, uint32);
+	uint32 typeId = gResearchLastItemSubject;
 	int lastDevelopmentFormat;
 	if (typeId != 0xFFFFFFFF) {
 		if (typeId >= 0x10000) {
diff --git a/src/world/park.c b/src/world/park.c
index 8e9ecb4ffc..725446b0b3 100644
--- a/src/world/park.c
+++ b/src/world/park.c
@@ -89,7 +89,7 @@ void park_init()
 	gParkRating = 0;
 	_guestGenerationProbability = 0;
 	gTotalRideValue = 0;
-	RCT2_GLOBAL(RCT2_ADDRESS_LAST_RESEARCHED_ITEM_SUBJECT, sint32) = -1;
+	gResearchLastItemSubject = (uint32)-1;
 
 	for (i = 0; i < 20; i++)
 		gMarketingCampaignDaysLeft[i] = 0;