diff --git a/backend/internal/core/currencies/currencies.go b/backend/internal/core/currencies/currencies.go
index 505b6b1..b6a12c0 100644
--- a/backend/internal/core/currencies/currencies.go
+++ b/backend/internal/core/currencies/currencies.go
@@ -90,10 +90,10 @@ func (cs *CurrencyRegistry) Slice() []Currency {
 }
 
 func (cs *CurrencyRegistry) IsSupported(code string) bool {
-	lower := strings.ToLower(code)
+	upper := strings.ToUpper(code)
 
 	cs.mu.RLock()
 	defer cs.mu.RUnlock()
-	_, ok := cs.registry[lower]
+	_, ok := cs.registry[upper]
 	return ok
 }
diff --git a/backend/internal/core/services/main_test.go b/backend/internal/core/services/main_test.go
index 57dce95..ecb07b0 100644
--- a/backend/internal/core/services/main_test.go
+++ b/backend/internal/core/services/main_test.go
@@ -6,6 +6,7 @@ import (
 	"os"
 	"testing"
 
+	"github.com/hay-kot/homebox/backend/internal/core/currencies"
 	"github.com/hay-kot/homebox/backend/internal/core/services/reporting/eventbus"
 	"github.com/hay-kot/homebox/backend/internal/data/ent"
 	"github.com/hay-kot/homebox/backend/internal/data/repo"
@@ -61,7 +62,12 @@ func TestMain(m *testing.M) {
 
 	tClient = client
 	tRepos = repo.New(tClient, tbus, os.TempDir()+"/homebox")
-	tSvc = New(tRepos)
+
+	defaults, _ := currencies.CollectionCurrencies(
+		currencies.CollectDefaults(),
+	)
+
+	tSvc = New(tRepos, WithCurrencies(defaults))
 	defer func() { _ = client.Close() }()
 
 	bootstrap()