diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+5.11.2
+  - Mouse events were modified so that the upper-left corner of the window is
+    (0,0) rather than (1,1).
+
 5.11.1
   - Add Generic instance for Image
   - nextEvent: stop trying to refresh on a resize event (fixes segfault
diff --git a/src/Graphics/Vty/Input/Mouse.hs b/src/Graphics/Vty/Input/Mouse.hs
--- a/src/Graphics/Vty/Input/Mouse.hs
+++ b/src/Graphics/Vty/Input/Mouse.hs
@@ -129,7 +129,7 @@
     case press of
             True -> do
                 button <- getSGRButton status
-                return $ EvMouseDown xCoord yCoord button modifiers
+                return $ EvMouseDown (xCoord-1) (yCoord-1) button modifiers
             False -> return $ EvMouseUp xCoord yCoord Nothing
 
 -- Attempt to classify a control sequence as an SGR mouse event. To
@@ -147,6 +147,6 @@
     let modifiers = getModifiers mods
     button <- getSGRButton mods
     case final of
-        'M' -> return $ EvMouseDown xCoord yCoord button modifiers
+        'M' -> return $ EvMouseDown (xCoord-1) (yCoord-1) button modifiers
         'm' -> return $ EvMouseUp   xCoord yCoord (Just button)
         _ -> failParse
diff --git a/vty.cabal b/vty.cabal
--- a/vty.cabal
+++ b/vty.cabal
@@ -1,5 +1,5 @@
 name:                vty
-version:             5.11.1
+version:             5.11.2
 license:             BSD3
 license-file:        LICENSE
 author:              AUTHORS