diff --git a/stepmania/src/NoteDataUtil.cpp b/stepmania/src/NoteDataUtil.cpp
index c976d80408..ec52e0b7e4 100644
--- a/stepmania/src/NoteDataUtil.cpp
+++ b/stepmania/src/NoteDataUtil.cpp
@@ -228,9 +228,7 @@ void NoteDataUtil::GetSMNoteDataString( const NoteData &in_, CString &notes_out
 				case TapNote::attack:		c = 'A'; break;
 				case TapNote::autoKeysound:	c = 'K'; break;
 				default: 
-					ASSERT(0);	// invalid enum value
-					c = '0'; 
-					break;
+					FAIL_M( ssprintf("tn %i", tn.type) );	// invalid enum value
 				}
 				sRet.append(1, c);