diff --git a/modules/bitcoin.py b/modules/bitcoin.py
index 524965c..69a397d 100644
--- a/modules/bitcoin.py
+++ b/modules/bitcoin.py
@@ -20,15 +20,16 @@ def bitcoin(phenny, input):
                    "like .bitcoin 1 EUR")
         return
 
-    if currency == 'BTC':
+    if currency.upper() == 'BTC':
         from_btc = True
         currency = input.group(4)
     else:
         from_btc = False
+        currency = currency.upper()
 
     if not currency:
         currency = 'USD'
-    currency = currency.strip()[:3]
+    currency = currency.strip()[:3].upper()
 
     try:
         amount = decimal.Decimal(amount)
diff --git a/modules/test/test_bitcoin.py b/modules/test/test_bitcoin.py
index d4f7d2b..9d87b3a 100644
--- a/modules/test/test_bitcoin.py
+++ b/modules/test/test_bitcoin.py
@@ -83,3 +83,10 @@ class TestCalc(unittest.TestCase):
 
         out = self.phenny.say.call_args[0][0]
         self.assertNotRegex(out, r'[\d\.]+ BTC')
+
+    def test_lettercase(self):
+        input = Mock(group=self.makegroup('1', 'btc', 'EuR'))
+        bitcoin(self.phenny, input)
+
+        out = self.phenny.say.call_args[0][0]
+        self.assertRegex(out, r'\d+\.\d{2} EUR')