diff --git a/src/Classes/ShaderLoader.gd b/src/Classes/ShaderLoader.gd
index 5a9bea477..8a0f6f31e 100644
--- a/src/Classes/ShaderLoader.gd
+++ b/src/Classes/ShaderLoader.gd
@@ -377,7 +377,7 @@ static func _shader_update_texture(
 
 static func _modify_texture_resource(
 	image: Image, resource_name: StringName, update_callable: Callable
-):
+) -> void:
 	var resource_proj = ResourceProject.new([], resource_name, image.get_size())
 	resource_proj.layers.append(PixelLayer.new(resource_proj))
 	resource_proj.frames.append(resource_proj.new_empty_frame())