src/tool/omniidl/cxx/cccp/cccp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tool/omniidl/cxx/cccp/cccp.c b/src/tool/omniidl/cxx/cccp/cccp.c
index 0198b1a..64d80ae 100644
--- a/src/tool/omniidl/cxx/cccp/cccp.c
+++ b/src/tool/omniidl/cxx/cccp/cccp.c
@@ -8034,7 +8034,7 @@ macroexpand (hp, op)
       else
 	parse_error = macarg (NULL_PTR, 0);
       if (parse_error) {
-	error_with_line (line_for_error (start_line), parse_error);
+	error_with_line (line_for_error (start_line), "%s", parse_error);
 	break;
       }
       i++;