1 files changed, 1 insertions, 0 deletions
diff --git a/id.c b/id.c
index e5f971d3e2..b6143971a1 100644
--- a/id.c
+++ b/id.c
@@ -41,6 +41,7 @@ Init_id(void)
     REGISTER_SYMID(idEach, "each");
     REGISTER_SYMID(idLength, "length");
     REGISTER_SYMID(idSize, "size");
+    REGISTER_SYMID(idEmptyP, "empty?");
     REGISTER_SYMID(idLambda, "lambda");
     REGISTER_SYMID(idIntern, "intern");
     REGISTER_SYMID(idGets, "gets");