diff --git a/Makefile b/Makefile
index cf11e3a255..74e6449236 100644
--- a/Makefile
+++ b/Makefile
@@ -296,7 +296,7 @@ mostlyclean: tidynonmodern tidymodern tidycheck
 	rm -f $(MID_SUBDIR)/*.s
 	find . \( -iname '*.1bpp' -o -iname '*.4bpp' -o -iname '*.8bpp' -o -iname '*.gbapal' -o -iname '*.lz' -o -iname '*.rl' -o -iname '*.latfont' -o -iname '*.hwjpnfont' -o -iname '*.fwjpnfont' \) -exec rm {} +
 	rm -f $(DATA_ASM_SUBDIR)/layouts/layouts.inc $(DATA_ASM_SUBDIR)/layouts/layouts_table.inc
-	rm -f $(DATA_ASM_SUBDIR)/maps/connections.inc $(DATA_ASM_SUBDIR)/maps/events.inc $(DATA_ASM_SUBDIR)/maps/groups.inc $(DATA_ASM_SUBDIR)/maps/headers.inc
+	rm -f $(DATA_ASM_SUBDIR)/maps/connections.inc $(DATA_ASM_SUBDIR)/maps/events.inc $(DATA_ASM_SUBDIR)/maps/groups.inc $(DATA_ASM_SUBDIR)/maps/headers.inc $(DATA_SRC_SUBDIR)/map_group_count.h
 	find $(DATA_ASM_SUBDIR)/maps \( -iname 'connections.inc' -o -iname 'events.inc' -o -iname 'header.inc' \) -exec rm {} +
 	rm -f $(AUTO_GEN_TARGETS)
 	@$(MAKE) clean -C libagbsyscall
diff --git a/map_data_rules.mk b/map_data_rules.mk
index 626cd47240..a045d1d420 100755
--- a/map_data_rules.mk
+++ b/map_data_rules.mk
@@ -23,6 +23,7 @@ $(MAPS_DIR)/groups.inc: $(MAPS_DIR)/map_groups.json
 $(MAPS_DIR)/connections.inc: $(MAPS_DIR)/groups.inc ;
 $(MAPS_DIR)/events.inc: $(MAPS_DIR)/connections.inc ;
 $(MAPS_DIR)/headers.inc: $(MAPS_DIR)/events.inc ;
+$(DATA_SRC_SUBDIR)/map_group_count.h: $(MAPS_DIR)/headers.inc ;
 include/constants/map_groups.h: $(MAPS_DIR)/headers.inc ;
 
 $(LAYOUTS_DIR)/layouts.inc: $(LAYOUTS_DIR)/layouts.json
diff --git a/src/data/map_group_count.h b/src/data/map_group_count.h
deleted file mode 100644
index 4fe8a21b3b..0000000000
--- a/src/data/map_group_count.h
+++ /dev/null
@@ -1 +0,0 @@
-static const u8 MAP_GROUP_COUNT[] = {57, 5, 5, 6, 7, 8, 9, 7, 7, 14, 8, 17, 10, 23, 13, 15, 15, 2, 2, 2, 3, 1, 1, 1, 108, 61, 89, 2, 1, 13, 1, 1, 3, 1, 0};