diff --git a/var/spack/repos/builtin/packages/sundials/package.py b/var/spack/repos/builtin/packages/sundials/package.py
index 8f025724306..5fae1e481b8 100644
--- a/var/spack/repos/builtin/packages/sundials/package.py
+++ b/var/spack/repos/builtin/packages/sundials/package.py
@@ -648,7 +648,8 @@ def filter_compilers(self):
 
         cxx_files = [
             "arkode/CXX_parallel/Makefile",
-            "arkode/CXX_serial/Makefile" "cvode/cuda/Makefile",
+            "arkode/CXX_serial/Makefile",
+            "cvode/cuda/Makefile",
             "cvode/raja/Makefile",
             "nvector/cuda/Makefile",
             "nvector/raja/Makefile",