diff --git a/src/eval.c b/src/eval.c
index 9f03385..6968fac 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -211,6 +211,8 @@ void init_special_form_handlers(LakeCtx *ctx)
     /* HANDLER("let", &_let); */
     /* HANDLER("let!", &_letB); */
     /* HANDLER("letrec", &_letrec); */
+
+    #undef HANDLER
 }
 
 gboolean is_special_form(LakeCtx *ctx, LakeList *expr)
diff --git a/src/primitive.c b/src/primitive.c
index b1b780e..ca26d6e 100644
--- a/src/primitive.c
+++ b/src/primitive.c
@@ -292,4 +292,6 @@ void bind_primitives(LakeCtx *ctx)
     /* string> */
     /* string-concatenate */
     /* string-slice */
+
+    #undef DEFINE
 }