diff --git a/ChangeLog b/ChangeLog
index 6958b0da17..e50886e192 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jul 15 18:31:18 2015  Eric Wong  <e@80x24.org>
+
+	* proc.c (proc_mark): remove redundant check
+	* vm.c (env_mark): ditto
+
 Wed Jul 15 17:27:40 2015  Eric Wong  <e@80x24.org>
 
 	* iseq.c (iseq_mark): remove check for data pointer
diff --git a/proc.c b/proc.c
index 1e8c117ff1..76a004dca1 100644
--- a/proc.c
+++ b/proc.c
@@ -50,7 +50,7 @@ proc_mark(void *ptr)
     RUBY_MARK_UNLESS_NULL(proc->block.self);
     RUBY_MARK_UNLESS_NULL(rb_vm_proc_envval(proc));
     if (proc->block.iseq && RUBY_VM_IFUNC_P(proc->block.iseq)) {
-	RUBY_MARK_UNLESS_NULL((VALUE)(proc->block.iseq));
+	rb_gc_mark((VALUE)(proc->block.iseq));
     }
     RUBY_MARK_LEAVE("proc");
 }
diff --git a/vm.c b/vm.c
index b2b87f8eb5..797333591c 100644
--- a/vm.c
+++ b/vm.c
@@ -422,7 +422,7 @@ env_mark(void * const ptr)
 
     if (env->block.iseq) {
 	if (RUBY_VM_IFUNC_P(env->block.iseq)) {
-	    RUBY_MARK_UNLESS_NULL((VALUE)env->block.iseq);
+	    rb_gc_mark((VALUE)env->block.iseq);
 	}
 	else {
 	    RUBY_MARK_UNLESS_NULL(env->block.iseq->self);