diff --git a/modules/fx-rates/src/Domain/FxRatesService.php b/modules/fx-rates/src/Domain/FxRatesService.php
index 279cdd3..84639e1 100644
--- a/modules/fx-rates/src/Domain/FxRatesService.php
+++ b/modules/fx-rates/src/Domain/FxRatesService.php
@@ -634,6 +634,10 @@ final class FxRatesService
             $rebasedRates[$code] = (float) $rate / (float) $baseRate;
         }
 
+        if ($snapshotBase !== '' && $snapshotBase !== $requestedBase) {
+            $rebasedRates[$snapshotBase] = 1 / (float) $baseRate;
+        }
+
         $filteredRates = $this->filterRates($rebasedRates, $symbols);
         if ($this->symbolsContain($symbols, $requestedBase)) {
             $filteredRates = [$requestedBase => 1.0] + $filteredRates;