diff --git a/dist-build/msys.sh b/dist-build/msys.sh
index d30d6102..7b5ea3c3 100755
--- a/dist-build/msys.sh
+++ b/dist-build/msys.sh
@@ -1,5 +1,4 @@
 #! /bin/sh
 
-export CFLAGS="-Os -march=pentium2 -mtune=nocona"
-
-./configure --disable-ssp && make -j3
+export CFLAGS="-O3 -fomit-frame-pointer -march=pentium2 -mtune=nocona"
+./configure --disable-ssp && make && make check