diff --git a/src/iodine.c b/src/iodine.c
index def8bbf..ff4502f 100644
--- a/src/iodine.c
+++ b/src/iodine.c
@@ -27,6 +27,7 @@
 #include <sys/socket.h>
 #include <fcntl.h>
 #include <err.h>
+#include <grp.h>
 #include <pwd.h>
 #include <arpa/inet.h>
 #include <zlib.h>
diff --git a/src/iodined.c b/src/iodined.c
index 6090a2f..2be01c5 100644
--- a/src/iodined.c
+++ b/src/iodined.c
@@ -25,6 +25,7 @@
 #include <sys/socket.h>
 #include <fcntl.h>
 #include <err.h>
+#include <grp.h>
 #include <time.h>
 #include <pwd.h>
 #include <arpa/inet.h>