diff --git a/app/Api/V1/Controllers/CurrencyController.php b/app/Api/V1/Controllers/CurrencyController.php
index d85b2abaab..3a41ac79a4 100644
--- a/app/Api/V1/Controllers/CurrencyController.php
+++ b/app/Api/V1/Controllers/CurrencyController.php
@@ -318,6 +318,10 @@ class CurrencyController extends Controller
         if ($this->repository->currencyInUse($currency)) {
             throw new FireflyException('200006: Currency in use.'); // @codeCoverageIgnore
         }
+        if ($this->repository->isFallbackCurrency($currency)) {
+            throw new FireflyException('200026: Currency is fallback.'); // @codeCoverageIgnore
+        }
+
         $this->repository->destroy($currency);
 
         return response()->json([], 204);
diff --git a/app/Http/Controllers/CurrencyController.php b/app/Http/Controllers/CurrencyController.php
index 163cbc051e..5f909449a0 100644
--- a/app/Http/Controllers/CurrencyController.php
+++ b/app/Http/Controllers/CurrencyController.php
@@ -183,6 +183,14 @@ class CurrencyController extends Controller
 
             return redirect(route('currencies.index'));
         }
+
+        if ($this->repository->isFallbackCurrency($currency)) {
+            $request->session()->flash('error', (string)trans('firefly.cannot_delete_fallback_currency', ['name' => e($currency->name)]));
+            Log::channel('audit')->info(sprintf('Tried to delete currency %s but is FALLBACK.', $currency->code));
+
+            return redirect(route('currencies.index'));
+        }
+
         Log::channel('audit')->info(sprintf('Deleted currency %s.', $currency->code));
         $this->repository->destroy($currency);
 
diff --git a/app/Repositories/Currency/CurrencyRepository.php b/app/Repositories/Currency/CurrencyRepository.php
index 44d621a6bf..1cdd92e448 100644
--- a/app/Repositories/Currency/CurrencyRepository.php
+++ b/app/Repositories/Currency/CurrencyRepository.php
@@ -537,4 +537,12 @@ class CurrencyRepository implements CurrencyRepositoryInterface
 
         return $service->update($currency, $data);
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function isFallbackCurrency(TransactionCurrency $currency): bool
+    {
+        return $currency->code === config('firefly.default_currency', 'EUR');
+    }
 }
diff --git a/app/Repositories/Currency/CurrencyRepositoryInterface.php b/app/Repositories/Currency/CurrencyRepositoryInterface.php
index f1727f7380..603be5d4f8 100644
--- a/app/Repositories/Currency/CurrencyRepositoryInterface.php
+++ b/app/Repositories/Currency/CurrencyRepositoryInterface.php
@@ -35,6 +35,14 @@ use Illuminate\Support\Collection;
  */
 interface CurrencyRepositoryInterface
 {
+
+    /**
+     * @param TransactionCurrency $currency
+     *
+     * @return bool
+     */
+    public function isFallbackCurrency(TransactionCurrency $currency): bool;
+
     /**
      * @param TransactionCurrency $currency
      *