diff --git a/var/spack/repos/builtin/packages/sundials/package.py b/var/spack/repos/builtin/packages/sundials/package.py
index 8f025724306a76f69ad628483d878627b955f3dd..5fae1e481b80f400f6b34898f7a4aba17a98bf00 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",