1 files changed, 1 insertions, 1 deletions
diff --git a/proc.c b/proc.c
index 2eb46ad5d2..4b67c69755 100644
--- a/proc.c
+++ b/proc.c
@@ -670,7 +670,7 @@ rb_block_clear_env_self(VALUE proc)
     rb_env_t *env;
     GetProcPtr(proc, po);
     GetEnvPtr(rb_vm_proc_envval(po), env);
-    env->env[0] = Qnil;
+    env->env[0] = Qfalse;
     return proc;
 }