diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3b4de03..8afa469 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -38,4 +38,4 @@ jobs:
          cc --version
          brew --prefix pcre2
          brew --prefix cmocka
-         cc -D_DEFAULT_SOURCE  -o mh -D VERSION=\"aa30377\" queue.c mh.c main.c -Wall $(pkg-config --cflags --libs libpcre2-8)
+         cc -o mh -D VERSION=\"aa30377\" queue.c mh.c main.c -Wall $(pkg-config --cflags --libs libpcre2-8)