diff --git a/mono/io-layer/processes.c b/mono/io-layer/processes.c
index 53c271a4..84bd3252 100644
--- a/mono/io-layer/processes.c
+++ b/mono/io-layer/processes.c
@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 #include <unistd.h>
 #ifdef HAVE_SIGNAL_H
 #include <signal.h>