diff --git a/include/arl/parser/ast.h b/include/arl/parser/ast.h
index a33ceee..6ed3de8 100644
--- a/include/arl/parser/ast.h
+++ b/include/arl/parser/ast.h
@@ -25,7 +25,6 @@ typedef enum
 /// Known symbols - may reference callables or values.
 typedef enum
 {
-  AST_KNOWN_NIL = 0,
   AST_KNOWN_PUTSTR,
 
   NUM_AST_KNOWNS,
diff --git a/src/parser/ast.c b/src/parser/ast.c
index f7a4772..e697a19 100644
--- a/src/parser/ast.c
+++ b/src/parser/ast.c
@@ -13,8 +13,6 @@ const char *ast_known_to_cstr(ast_known_t known)
 {
   switch (known)
   {
-  case AST_KNOWN_NIL:
-    return "nil";
   case AST_KNOWN_PUTSTR:
     return "putstr";
   default:
diff --git a/src/parser/parser.c b/src/parser/parser.c
index b5da32c..abaabd0 100644
--- a/src/parser/parser.c
+++ b/src/parser/parser.c
@@ -125,7 +125,7 @@ parse_err_t parse_symbol(parse_stream_t *stream, ast_node_t *ret)
   symbol.size = sv_while(symbol, SYMBOL_CHARS);
 
   // see if symbol is one of the already known symbols
-  static_assert(NUM_AST_KNOWNS == 2, "Expected number of AST KNOWN");
+  static_assert(NUM_AST_KNOWNS == 1, "Expected number of AST_KNOWNs");
   for (ast_known_t i = 0; i < NUM_AST_KNOWNS; ++i)
   {
     const char *possible_known = ast_known_to_cstr(i);