diff --git a/gnucash/report/reports/standard/advanced-portfolio.scm b/gnucash/report/reports/standard/advanced-portfolio.scm
index 2419aa4c4e..4d5d0767d7 100644
--- a/gnucash/report/reports/standard/advanced-portfolio.scm
+++ b/gnucash/report/reports/standard/advanced-portfolio.scm
@@ -1001,6 +1001,11 @@ by preventing negative stock balances.<br/>")
                    (lambda (foreign domestic date)
                     (find-price (gnc-pricedb-lookup-latest-any-currency pricedb foreign)
                                 domestic)))
+                  ((pricedb-before)
+                   (lambda (foreign domestic date)
+                    (find-price (gnc-pricedb-lookup-nearest-before-any-currency-t64
+		                 pricedb foreign (time64CanonicalDayTime date))
+                                domestic)))
                   ((pricedb-nearest)
                    (lambda (foreign domestic date)
                     (find-price (gnc-pricedb-lookup-nearest-in-time-any-currency-t64
diff --git a/gnucash/report/reports/standard/portfolio.scm b/gnucash/report/reports/standard/portfolio.scm
index 9f98b46363..09ac1287a8 100644
--- a/gnucash/report/reports/standard/portfolio.scm
+++ b/gnucash/report/reports/standard/portfolio.scm
@@ -216,19 +216,23 @@
                                         (cons #f (gnc-numeric-zero)))))
                        (if price (gnc-price-list-destroy price))
                        fn)))
+                  ((pricedb-before)
+                   (lambda (foreign date)
+                     (let ((price (gnc-pricedb-lookup-nearest-before-any-currency-t64
+                                   pricedb foreign (time64CanonicalDayTime date))))
+                       (cond
+                        ((null? price) (cons #f 0))
+                        (else (let ((p (car price)))
+                                (gnc-price-ref p)
+                                (gnc-price-list-destroy price)
+                                (cons p (gnc-price-get-value p))))))))
                   ((pricedb-nearest)
                    (lambda (foreign date)
                      (let*  ((price
                              (gnc-pricedb-lookup-nearest-in-time-any-currency-t64
                               pricedb foreign (time64CanonicalDayTime date)))
                             (fn (if (and price (> (length price) 0))
-                                    (let* ((the_price
-                                            (if (gnc-commodity-equiv
-                                                 foreign
-                                                 (gnc-price-get-commodity (car price)))
-                                                (car price)
-                                                (gnc-price-invert (car price))))
-                                           (v (gnc-price-get-value (car price))))
+                                    (let* ((v (gnc-price-get-value (car price))))
                                            (gnc-price-ref (car price))
                                            (cons (car price) v))
                                          (cons #f (gnc-numeric-zero)))))