diff --git a/src/plugins/properties.c b/src/plugins/properties.c
index 6b6e263..4449559 100644
--- a/src/plugins/properties.c
+++ b/src/plugins/properties.c
@@ -17,6 +17,7 @@
 
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>