diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 1fb196db29..d25ee6adca 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -3,6 +3,7 @@
 #include "types.hh"
 
 #include <map>
+#include <sys/types.h>
 
 
 namespace nix {