diff --git a/src/tools/jam/Jambase b/src/tools/jam/Jambase
index 42c85638fc..9e0726b377 100644
--- a/src/tools/jam/Jambase
+++ b/src/tools/jam/Jambase
@@ -1498,7 +1498,7 @@ rule Yacc
 {
 	local _h ;
 
-	_h = $(<:BS=.h) ;
+	_h = [ FGristFiles $(<:BS=.h) ] ;
 
 	# Some places don't have a yacc.