diff --git a/tests/optional_scalars_generated.h b/tests/optional_scalars_generated.h
index c295eba..f71f98d 100644
--- a/tests/optional_scalars_generated.h
+++ b/tests/optional_scalars_generated.h
@@ -6,6 +6,13 @@
 
 #include "flatbuffers/flatbuffers.h"
 
+// Ensure the included flatbuffers.h is the same version as when this file was
+// generated, otherwise it may not be compatible.
+static_assert(FLATBUFFERS_VERSION_MAJOR == 2 &&
+              FLATBUFFERS_VERSION_MINOR == 0 &&
+              FLATBUFFERS_VERSION_REVISION == 8,
+             "Non-compatible flatbuffers version included");
+
 namespace optional_scalars {
 
 struct ScalarStuff;