diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+5.11.3
+  - Fix mouse event offsets in mouse-up events
+
 5.11.2
   - Mouse events were modified so that the upper-left corner of the window is
     (0,0) rather than (1,1).
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
@@ -130,7 +130,7 @@
             True -> do
                 button <- getSGRButton status
                 return $ EvMouseDown (xCoord-1) (yCoord-1) button modifiers
-            False -> return $ EvMouseUp xCoord yCoord Nothing
+            False -> return $ EvMouseUp (xCoord-1) (yCoord-1) Nothing
 
 -- Attempt to classify a control sequence as an SGR mouse event. To
 -- get here we should have already read "\ESC[<" so that will not be
@@ -148,5 +148,5 @@
     button <- getSGRButton mods
     case final of
         'M' -> return $ EvMouseDown (xCoord-1) (yCoord-1) button modifiers
-        'm' -> return $ EvMouseUp   xCoord yCoord (Just button)
+        'm' -> return $ EvMouseUp   (xCoord-1) (yCoord-1) (Just button)
         _ -> failParse
diff --git a/vty.cabal b/vty.cabal
--- a/vty.cabal
+++ b/vty.cabal
@@ -1,5 +1,5 @@
 name:                vty
-version:             5.11.2
+version:             5.11.3
 license:             BSD3
 license-file:        LICENSE
 author:              AUTHORS