diff --git a/jam/make.c b/jam/make.c
index 292beadaf8..724ab886e0 100644
--- a/jam/make.c
+++ b/jam/make.c
@@ -57,6 +57,7 @@
 # include "variable.h"
 # include "rules.h"
 
+# include "hcache.h"
 # include "search.h"
 # include "newstr.h"
 # include "make.h"