diff --git a/contrib/gitian-descriptors/gitian-win32.yml b/contrib/gitian-descriptors/gitian-win32.yml
index a8a823cac..95db2d906 100644
--- a/contrib/gitian-descriptors/gitian-win32.yml
+++ b/contrib/gitian-descriptors/gitian-win32.yml
@@ -30,6 +30,7 @@ script: |
   #
   STAGING=$HOME/staging
   HOST=i686-w64-mingw32
+  OPTFLAGS='-O2'
   #
   mkdir -p $STAGING
   cd $STAGING
@@ -43,12 +44,12 @@ script: |
   export PATH=$STAGING/host/bin:$PATH
   export TAR_OPTIONS=--mtime=`echo $REFERENCE_DATETIME | awk '{ print $1 }'`
   ./autogen.sh
-  ./configure --bindir=$OUTDIR --prefix=$STAGING --host=$HOST --with-qt-plugindir=$STAGING/plugins  --with-qt-incdir=$STAGING/include --with-qt-bindir=$STAGING/host/bin --with-boost=$STAGING --disable-maintainer-mode --with-protoc-bindir=$STAGING/host/bin --disable-dependency-tracking CPPFLAGS="-I$STAGING/include" LDFLAGS="-L$STAGING/lib" CXXFLAGS="-frandom-seed=bitcoin"
+  ./configure --bindir=$OUTDIR --prefix=$STAGING --host=$HOST --with-qt-plugindir=$STAGING/plugins  --with-qt-incdir=$STAGING/include --with-qt-bindir=$STAGING/host/bin --with-boost=$STAGING --disable-maintainer-mode --with-protoc-bindir=$STAGING/host/bin --disable-dependency-tracking CPPFLAGS="-I$STAGING/include ${OPTFLAGS}" LDFLAGS="-L$STAGING/lib ${OPTFLAGS}" CXXFLAGS="-frandom-seed=bitcoin ${OPTFLAGS}"
   make dist
   mkdir -p distsrc
   cd distsrc
   tar --strip-components=1 -xf ../bitcoin-*.tar.*
-  ./configure --bindir=$OUTDIR --prefix=$STAGING --host=i686-w64-mingw32 --with-qt-plugindir=$STAGING/plugins  --with-qt-incdir=$STAGING/include --with-qt-bindir=$STAGING/host/bin --with-boost=$STAGING --disable-maintainer-mode --with-protoc-bindir=$STAGING/host/bin --disable-dependency-tracking CPPFLAGS="-I$STAGING/include" LDFLAGS="-L$STAGING/lib" CXXFLAGS="-frandom-seed=bitcoin"
+  ./configure --bindir=$OUTDIR --prefix=$STAGING --host=i686-w64-mingw32 --with-qt-plugindir=$STAGING/plugins  --with-qt-incdir=$STAGING/include --with-qt-bindir=$STAGING/host/bin --with-boost=$STAGING --disable-maintainer-mode --with-protoc-bindir=$STAGING/host/bin --disable-dependency-tracking CPPFLAGS="-I$STAGING/include ${OPTFLAGS}" LDFLAGS="-L$STAGING/lib ${OPTFLAGS}" CXXFLAGS="-frandom-seed=bitcoin ${OPTFLAGS}"
   export LD_PRELOAD=/usr/lib/faketime/libfaketime.so.1
   export FAKETIME=$REFERENCE_DATETIME
   export TZ=UTC