diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index a350f97e3a1a4eb571c3355e01b77cc976787577..a62be78fc07b18255d8c322791ec0fc9743541da 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -22,7 +22,9 @@
  * License along with this program; if not,  see <http://www.gnu.org/licenses>
  */
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
diff --git a/tools/lib/bpf/libbpf_errno.c b/tools/lib/bpf/libbpf_errno.c
index d9ba851bd7f9fefed4d17092c49d44f7bded6671..d2d17226d9d6bb2a83b90682e2c7e2032f117cca 100644
--- a/tools/lib/bpf/libbpf_errno.c
+++ b/tools/lib/bpf/libbpf_errno.c
@@ -20,6 +20,7 @@
  * License along with this program; if not,  see <http://www.gnu.org/licenses>
  */
 
+#undef _GNU_SOURCE
 #include <stdio.h>
 #include <string.h>