diff --git a/src/bk_point.c b/src/bk_point.c
index 9c5f281dbed3fd5186b39bd2c4a1bedc769f5ab1..a5c1df19c3ac2d689527915909a1e7dac2d47899 100644
--- a/src/bk_point.c
+++ b/src/bk_point.c
@@ -198,7 +198,7 @@ void bk_point(double *xp,
 		     lambd0,
 		 varp,
 		 searchnb, //
-		 usesbbt, //
+		 &usesbbt, //
 		     ierr,
 		     glsmth);