diff --git a/src/04-multiprocessing/.clangd b/src/04-multiprocessing/.clangd
index 9b0ded0..2322919 100644
--- a/src/04-multiprocessing/.clangd
+++ b/src/04-multiprocessing/.clangd
@@ -2,7 +2,6 @@ CompileFlags:
     Add:
         # Architecture and cross-compilation
         - "--target=aarch64-linux-gnu"
-        - "-D_GNU_SOURCE"
 
         # Setup sysroot for buildroot
         - "--sysroot=/buildroot/output/host/aarch64-buildroot-linux-gnu/sysroot"
diff --git a/src/04-multiprocessing/process.c b/src/04-multiprocessing/process.c
index 5153e38..23c4ba9 100644
--- a/src/04-multiprocessing/process.c
+++ b/src/04-multiprocessing/process.c
@@ -1,4 +1,4 @@
-// #define _GNU_SOURCE
+#define _GNU_SOURCE
 
 #include <stdio.h>
 #include <stdlib.h>