diff --git a/quad/src/test/test.c b/quad/src/test/test.c
index 98863ecd8f23ad713677726f2c866f7223f81585..a5573bf45b29ef67c3850e560e7c5932c13b1bb8 100644
--- a/quad/src/test/test.c
+++ b/quad/src/test/test.c
@@ -1,4 +1,5 @@
 #include "test.h"
+#include <unistd.h>
 
 static int num_tests = 0;
 static struct Test tests[255];