diff --git a/src/cc/bcc_elf.c b/src/cc/bcc_elf.c
index e2909d7c92d9..4342d593af38 100644
--- a/src/cc/bcc_elf.c
+++ b/src/cc/bcc_elf.c
@@ -13,6 +13,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>