diff --git a/CHANGES b/CHANGES
index 919ff664..941e1d88 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,9 @@ What's New for OpenJPEG
 ! : changed
 + : added
 
+December 11, 2010
+* [antonin] fixed flags when building jp3d with MinGW
+
 December 10, 2010
 ! [szukw000] changed build choice in configure.ac/Makefile.am/Makefile.nix:
              shared xor static
diff --git a/jp3d/libjp3dvm/CMakeLists.txt b/jp3d/libjp3dvm/CMakeLists.txt
index f27ca1d4..23482483 100644
--- a/jp3d/libjp3dvm/CMakeLists.txt
+++ b/jp3d/libjp3dvm/CMakeLists.txt
@@ -1,5 +1,7 @@
 IF(UNIX OR CYGWIN)
  ADD_DEFINITIONS(-O3)
+ELSEIF(MINGW)
+ ADD_DEFINITIONS(-Os)
 ELSEIF(WIN32)
   ADD_DEFINITIONS(/Os)
 ENDIF(UNIX OR CYGWIN)