diff --git a/sys/ddb/db_expr.c b/sys/ddb/db_expr.c
index c206a573e7cb..0b473735e3c9 100644
--- a/sys/ddb/db_expr.c
+++ b/sys/ddb/db_expr.c
@@ -261,7 +261,7 @@ db_shift_expr(db_expr_t *valuep)
 		lhs <<= rhs;
 	    else {
 		/* Shift right is unsigned */
-		lhs = (unsigned) lhs >> rhs;
+		lhs = (db_addr_t)lhs >> rhs;
 	    }
 	    t = db_read_token();
 	}