diff --git a/R-later.spec b/R-later.spec
index 912ad6b..321fdf9 100644
--- a/R-later.spec
+++ b/R-later.spec
@@ -9,8 +9,7 @@ Version:          0.7.4
 Release:          1%{?dist}
 Summary:          Utilities for Delaying Function Execution
 
-# Main GPLv2+; TinyCThread: MIT
-License:          GPLv2+ and MIT
+License:          GPLv2+
 URL:              https://cran.r-project.org/web/packages/%{packname}/index.html
 Source0:          https://cran.r-project.org/src/contrib/%{packname}_%{version}.tar.gz
 
@@ -50,6 +49,10 @@ Development files for %{name}.
 %prep
 %setup -q -c -n %{packname}
 
+# Ensure we don't accidentally use this bundled code.
+rm -r %{packname}/src/tinycthread
+sed -i -e '/tinycthread/d' %{packname}/MD5
+
 
 %build