diff --git a/src/nix-env/profiles.hh b/src/nix-env/profiles.hh
index 2bd05045ea..99c20f42d1 100644
--- a/src/nix-env/profiles.hh
+++ b/src/nix-env/profiles.hh
@@ -3,6 +3,8 @@
 
 #include "types.hh"
 
+#include <time.h>
+
 
 namespace nix {