diff --git a/build/make/configure.sh b/build/make/configure.sh
index 4b732e63f96055290233a6faa65eae6cb8d024e7..73cb60085da698c03b5e69fd38357134e1a1a579 100755
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -518,6 +518,7 @@ process_common_toolchain() {
                 tgt_os=darwin9
                 ;;
             *mingw32*|*cygwin*)
+                [ -z "$tgt_isa" ] && tgt_isa=x86
                 tgt_os=win32
                 ;;
             *linux*|*bsd*)