diff --git a/include/chibi/features.h b/include/chibi/features.h
index fd47f12a..8ad0a536 100644
--- a/include/chibi/features.h
+++ b/include/chibi/features.h
@@ -709,7 +709,7 @@
 #define SEXP_API    __declspec(dllimport)
 #endif
 #else
-#define SEXP_API
+#define SEXP_API    extern
 #endif
 
 /************************************************************************/