diff --git a/Dockerfile b/Dockerfile
index a6c6936b..7920fd90 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,9 @@ COPY data /build/data
 COPY src /build/src
 COPY tests build/tests
 COPY default_diagnostic_templates build/default_diagnostic_templates
+# Debug: List contents of the directory to verify it was copied correctly
+RUN ls -al /build/default_diagnostic_templates
+
 # Don't build release, so we get template debugging output.
 RUN cargo build