1 files changed, 2 insertions, 1 deletions
diff --git a/test/test_syntax.c b/test/test_syntax.c
index 19f4a463..c2de8526 100644
--- a/test/test_syntax.c
+++ b/test/test_syntax.c
@@ -4,6 +4,7 @@
 #undef NDEBUG
 
 #include "serd/syntax.h"
+#include "zix/attributes.h"
 
 #include <assert.h>
 
@@ -49,7 +50,7 @@ test_syntax_has_graphs(void)
   assert(serd_syntax_has_graphs(SERD_TRIG));
 }
 
-int
+ZIX_PURE_FUNC int
 main(void)
 {
   test_syntax_by_name();