diff --git a/src/bun.js/bindings/uv-posix-polyfills.c b/src/bun.js/bindings/uv-posix-polyfills.c
index aac416b803..8b64b8711f 100644
--- a/src/bun.js/bindings/uv-posix-polyfills.c
+++ b/src/bun.js/bindings/uv-posix-polyfills.c
@@ -5,6 +5,9 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#if defined(__GNUC__) && !defined(_GNU_SOURCE)
+#define _GNU_SOURCE
+#endif
 #include <dlfcn.h>
 
 // libuv does the annoying thing of #undef'ing these