diff --git a/tests/generator_scripts/index.yaml b/tests/generator_scripts/index.yaml
index 788c8bd58efd077ea3a47884b260a65ad2dc49dc..c87977f3761739985b65e64e5b069b0359efdce0 100644
--- a/tests/generator_scripts/index.yaml
+++ b/tests/generator_scripts/index.yaml
@@ -94,7 +94,7 @@ MdSpanLbStreaming:
 
 CudaKernels:
   sfg-args:
-    file-extensions: ["cuh", "cu"]
+    file-extensions: ["hpp", "cu"]
   compile:
     cxx: nvcc
     cxx-flags: