Index: src/Tuples/TupleExpansion.cc
===================================================================
--- src/Tuples/TupleExpansion.cc	(revision 14a33790123fdbf7f1d2d6486abc2cb902f0f91f)
+++ src/Tuples/TupleExpansion.cc	(revision 6013bd75b2059dd159f97c81e5c0ca86a9110fdf)
@@ -225,5 +225,5 @@
 		if ( ! typeMap.count( tupleSize ) ) {
 			// generate struct type to replace tuple type based on the number of components in the tuple
-			StructDecl * decl = new StructDecl( toString( "_tuple_type_", tupleSize  ) );
+			StructDecl * decl = new StructDecl( toString( "_tuple", tupleSize, "_" ) );
 			decl->set_body( true );
 			for ( size_t i = 0; i < tupleSize; ++i ) {