diff --git a/src/cbor/encoder.cr b/src/cbor/encoder.cr
index 5360229..67bf1c4 100644
--- a/src/cbor/encoder.cr
+++ b/src/cbor/encoder.cr
@@ -45,8 +45,8 @@ class CBOR::Encoder
   end
 
   def write(value : Time)
-	write(CBOR::Tag::RFC3339Time)
-	write(value.to_rfc3339)
+    write(CBOR::Tag::RFC3339Time)
+    write(value.to_rfc3339)
   end