diff --git a/CHANGES.rst b/CHANGES.rst
index 13282dee..f055162a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -155,6 +155,10 @@ Changes in this release include the following:
 
 * Performance update for `wx.lib.agw.customtreectrl` (#1049)
 
+* Fix drawing of ticks in wx.lib.agw.speedmeter when there are negative bounds
+  values. (#1013)
+
+
 
 
 4.0.3 "The show must go on. (Die show-stoppers! Die!)"
diff --git a/wx/lib/agw/speedmeter.py b/wx/lib/agw/speedmeter.py
index ba138720..63eab9c7 100644
--- a/wx/lib/agw/speedmeter.py
+++ b/wx/lib/agw/speedmeter.py
@@ -971,10 +971,11 @@ class SpeedMeter(BufferedWindow):
 
                     for tcount in range(ticknum):
                         if direction == "Advance":
-                            oldinterval = (oldinterval + spacing) - start
-                            stint = oldinterval
+                            oldinterval = (oldinterval + spacing)
+                            stint = oldinterval - start
                         else:
-                            oldinterval = start + (oldinterval + spacing)
+                            #oldinterval = start + (oldinterval + spacing)
+                            oldinterval = (oldinterval + spacing)
                             stint = end - oldinterval
 
                         angle = (stint/float(span))*(startangle-endangle) - startangle