diff --git a/src/game/engine/src/modules/management/turn_processor.gd b/src/game/engine/src/modules/management/turn_processor.gd
index 9f9d2e16..16a0463c 100644
--- a/src/game/engine/src/modules/management/turn_processor.gd
+++ b/src/game/engine/src/modules/management/turn_processor.gd
@@ -144,8 +144,7 @@ func _process_research(player: RefCounted) -> void:  # Player
 					city as CityScript, game_map
 				)
 				var yields: Dictionary = city.get_yields(tile_json)
-				var building_sci: int = _sum_city_building_effect(city as CityScript, "science")
-				player.research_progress += int((yields.get("science", 0) + building_sci) * sci_modifier)
+				player.research_progress += int(yields.get("science", 0) * sci_modifier)
 
 	# Check if researching a spell (not a tech)
 	var spell_data: Dictionary = DataLoader.get_spell(player.researching)