diff --git a/scripts/demo1.py b/scripts/demo1.py
index 9099847..2f4037d 100755
--- a/scripts/demo1.py
+++ b/scripts/demo1.py
@@ -44,6 +44,7 @@ def draw_current_color():
 	hdc.solid_rectangle(cmd2_rect[0] + 6, cmd2_rect[1] + 6, cmd2_rect[0] + 54, cmd2_rect[1] + 54)
 	
 def select_next_color():
+	global current_color
 	current_color += 1
 	if current_color == len(color_list):
 		current_color = 0
@@ -99,6 +100,7 @@ def draw_current_tool():
 	hdc.bitblt(cmd1_rect[0] + 6, cmd1_rect[1] + 6, cmd1_rect[0] + 54, cmd1_rect[1] + 54, hdc_bits, 0, 0, 0)
 	
 def select_next_tool():
+	global current_tool
 	current_tool += 1
 	if current_tool == len(tool_list):
 		current_tool = 0