diff --git a/tools/x-win/compile.sh b/tools/x-win/compile.sh
index 95e581b2d1..fb4d4aa85f 100755
--- a/tools/x-win/compile.sh
+++ b/tools/x-win/compile.sh
@@ -70,4 +70,4 @@ LDFLAGS="-L${PREFIX}/lib" ./waf configure \
 	--also-include=${PREFIX}/include \
 	$ARDOURCFG \
 	--prefix=${PREFIX}
-./waf
+./waf ${CONCURRENCY}