diff --git a/src/plugins/ipmi_intf.c b/src/plugins/ipmi_intf.c
index 090ab2f..6cf0553 100644
--- a/src/plugins/ipmi_intf.c
+++ b/src/plugins/ipmi_intf.c
@@ -31,6 +31,7 @@
  */
 #define _XOPEN_SOURCE 700
 #define _GNU_SOURCE 1
+#define _DARWIN_C_SOURCE 1
 
 #include <stdio.h>
 #include <stdlib.h>