Index: src/ResolvExpr/Resolver.cc
===================================================================
--- src/ResolvExpr/Resolver.cc	(revision ef5b8288bd2be4816de42f8ea6a9b3d5e5971b31)
+++ src/ResolvExpr/Resolver.cc	(revision bdf22ae431e956481d293596f76b2f322345b749)
@@ -562,7 +562,7 @@
 		// TODO: Replace *exception type with &exception type.
 		if ( throwStmt->get_expr() ) {
-			StructDecl * exception_decl = indexer.lookupMutableStruct( "__cfaabi_ehm__base_exception_t" );
+			const StructDecl * exception_decl = indexer.lookupStruct( "__cfaabi_ehm__base_exception_t" );
 			assert( exception_decl );
-			Type * exceptType = new PointerType( noQualifiers, new StructInstType( noQualifiers, exception_decl ) );
+			Type * exceptType = new PointerType( noQualifiers, new StructInstType( noQualifiers, const_cast<StructDecl *>(exception_decl) ) );
 			findSingleExpression( throwStmt->expr, exceptType, indexer );
 		}