diff --git a/src/chunkserver/iostat.h b/src/chunkserver/iostat.h
index e1a50e97..09a04c67 100644
--- a/src/chunkserver/iostat.h
+++ b/src/chunkserver/iostat.h
@@ -28,6 +28,7 @@
 #include <algorithm>
 #include <unordered_map>
 #include <vector>
+#include <sys/sysmacros.h>
 
 #include <sys/stat.h>
 #include <sys/types.h>