1 files changed, 4 insertions, 3 deletions
diff --git a/proc.c b/proc.c
index 3bcb6cfbc8..710ab065d1 100644
--- a/proc.c
+++ b/proc.c
@@ -379,11 +379,12 @@ proc_new(VALUE klass, int is_lambda)
 	}
     }
 
-    if (block->proc) {
-	return block->proc;
+    procval = block->proc;
+    if (procval && RBASIC(procval)->klass == klass) {
+	return procval;
     }
 
-    procval = vm_make_proc(th, cfp, block);
+    procval = vm_make_proc(th, cfp, block, klass);
 
     if (is_lambda) {
 	rb_proc_t *proc;