diff --git a/m.sh b/m.sh
index e9b2f8f..1973f14 100755
--- a/m.sh
+++ b/m.sh
@@ -14,6 +14,7 @@ if git rev-parse --git-dir >/dev/null 2>&1; then
 fi
 
 set -e
+mkdir -p build
 OUTDIR="$(realpath ./build)"
 MODROOT="./v3"
 PACKAGE="./cmd/tlswrapper"