diff --git a/Scenes/Global/game_data.gd b/Scenes/Global/game_data.gd
index 3b0e22c..4c4f295 100644
--- a/Scenes/Global/game_data.gd
+++ b/Scenes/Global/game_data.gd
@@ -44,7 +44,7 @@ func _on_job_spawn_timer_timeout() -> void:
 	#generate_job()
 	draw_job()
 
-func generate_job():
+func generate_job() -> void:
 	if not current_job_count >= MAX_JOBS:
 		var random_job: JobData = jobs_array.pick_random()
 		current_job_count += 1
@@ -54,7 +54,7 @@ func generate_job():
 		new_job.job_accepted.connect(_on_job_accepted_pressed)
 		job_interact.emit()
 
-func draw_job():
+func draw_job() -> void:
 	if not current_job_count >= MAX_JOBS:
 		var job: JobData = generate_random_job()
 		current_job_count += 1
@@ -80,7 +80,7 @@ func generate_random_job() -> JobData:
 	print('Generated new job: %s (%d € | %d xp | %d pcs)' % [new_job.job_name, new_job.job_reward, new_job.job_experience, new_job.job_amount])
 	return new_job
 
-func _on_job_accepted_pressed(accepted_job):
+func _on_job_accepted_pressed(accepted_job) -> void:
 	print("Job accepted")
 	PlayerData.jobs.append(accepted_job.job_data)
 	print(PlayerData.jobs[0].job_name)
diff --git a/Scenes/Shop/Printers/printers.gd b/Scenes/Shop/Printers/printers.gd
index 39fca44..0d04519 100644
--- a/Scenes/Shop/Printers/printers.gd
+++ b/Scenes/Shop/Printers/printers.gd
@@ -14,5 +14,5 @@ func _ready() -> void:
 	
 	printer_purchase_requested.connect(GameData._on_shop_printer_purchase_req)
 
-func _buy_printer_pressed(bought_printer):
+func _buy_printer_pressed(bought_printer) -> void:
 	printer_purchase_requested.emit(bought_printer.printer_data)
diff --git a/Scenes/UI/ui.gd b/Scenes/UI/ui.gd
index 4f4223c..62aa430 100644
--- a/Scenes/UI/ui.gd
+++ b/Scenes/UI/ui.gd
@@ -26,11 +26,11 @@ func _ready() -> void:
 	GameData.printer_bought.connect(_on_printer_bought)
 
 # --- Experience, Level and Money update ---
-func _on_xp_changed(xp):
+func _on_xp_changed(xp) -> void:
 	%Experience.value = xp
-func _on_level_changed(level):
+func _on_level_changed(level) -> void:
 	%Level.text = 'Level: %d' % level
-func _on_money_changed(money):
+func _on_money_changed(money) -> void:
 	%Money.text = 'Money: %.2f €' % money
 
 func _on_job_generated(job: Node) -> void: