diff --git a/build.sh b/build.sh
index bfa7e8c331..fd6587267d 100755
--- a/build.sh
+++ b/build.sh
@@ -274,6 +274,7 @@ find_os() {
         *CYGWIN_NT*) OS=windows;;
         *CYGWIN*) OS=windows;;
         MINGW32*) OS=windows;;
+        MINGW64*) OS=windows;;
         MSYS_NT*) OS=windows;;
         *darwin*) OS=macosx;;
         *Darwin*) OS=macosx;;