diff --git a/pam_yubico.c b/pam_yubico.c
index fc6bde4..96f6ae1 100644
--- a/pam_yubico.c
+++ b/pam_yubico.c
@@ -36,6 +36,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
diff --git a/util.c b/util.c
index 63c7f7c..af19bfe 100644
--- a/util.c
+++ b/util.c
@@ -36,6 +36,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <pwd.h>
+#include <unistd.h>
 
 #include "util.h"