diff --git a/intel/test_decode.c b/intel/test_decode.c
index d7025f03..93f47efc 100644
--- a/intel/test_decode.c
+++ b/intel/test_decode.c
@@ -91,7 +91,10 @@ compare_batch(struct drm_intel_decode *ctx, const char *batch_filename)
 {
 	FILE *out = NULL;
 	void *ptr, *ref_ptr, *batch_ptr;
-	size_t size, ref_size, batch_size;
+#ifdef HAVE_OPEN_MEMSTREAM
+	size_t size;
+#endif
+	size_t ref_size, batch_size;
 	const char *ref_suffix = "-ref.txt";
 	char *ref_filename;