diff --git a/docs/changes.txt b/docs/changes.txt
index 8885427009..062db24483 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -601,6 +601,7 @@ wxGTK:
 
 wxMSW:
 
+- Fix regression in wxDC drawing with bottom-to-top y axis (Artur Wieczorek).
 - Fix compilation with C++Builder XE compiler (Nichka).
 - Fix best height of wxSlider with labels but without ticks (Artur Wieczorek).
 - Fix initial text value of wxSpinCtrlDouble (Laurent Poujoulat).
diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index abd8956f34..d9168af520 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -2007,7 +2007,7 @@ void wxMSWDCImpl::RealizeScaleAndOrigin()
     // Becaue only devExtX/logExtX ratio and devExtY/logExtY ratio are counted
     // we can reduce the fractions to avoid large absolute numbers
     // and possible arithmetic overflows.
-    unsigned int gcd = CalcGCD(abs(devExtX), abs(logExtX));
+    int gcd = CalcGCD(abs(devExtX), abs(logExtX));
     devExtX /= gcd;
     logExtX /= gcd;
     gcd = CalcGCD(abs(devExtY), abs(logExtY));