diff --git a/test/run-tests.c b/test/run-tests.c
index 76255a62..fb163037 100644
--- a/test/run-tests.c
+++ b/test/run-tests.c
@@ -24,6 +24,8 @@
 
 #ifdef _WIN32
 # include <io.h>
+#else
+# include <unistd.h>
 #endif
 
 #include "uv.h"