diff --git a/ChangeLog b/ChangeLog
index e9822eeb59..cd7e885ce0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jul 25 12:21:11 2014  Santiago Pastorino  <santiago@wyeworks.com>
+
+	* compile.c (defined_expr): make the condition if the receiver
+	  is explicit or implicit cleaner.  [fix GH-681]
+
 Fri Jul 25 03:53:52 2014  Eric Hodel  <drbrain@segment7.net>
 
 	* doc/keywords.rdoc:  [DOC] Describe each keyword.
diff --git a/compile.c b/compile.c
index a77751087b..051b369fc1 100644
--- a/compile.c
+++ b/compile.c
@@ -2899,17 +2899,10 @@ defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *ret,
       case NODE_VCALL:
       case NODE_FCALL:
       case NODE_ATTRASGN:{
-	int self = TRUE;
+	const int explicit_receiver =
+	    (type == NODE_CALL ||
+	     (type == NODE_ATTRASGN && !private_recv_p(node)));
 
-	switch (type) {
-	  case NODE_ATTRASGN:
-	    if (private_recv_p(node)) break;
-	  case NODE_CALL:
-	    self = FALSE;
-	    break;
-	  default:
-	    /* through */;
-	}
 	if (!lfinish[1]) {
 	    lfinish[1] = NEW_LABEL(nd_line(node));
 	}
@@ -2917,7 +2910,7 @@ defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *ret,
 	    defined_expr(iseq, ret, node->nd_args, lfinish, Qfalse);
 	    ADD_INSNL(ret, nd_line(node), branchunless, lfinish[1]);
 	}
-	if (!self) {
+	if (explicit_receiver) {
 	    defined_expr(iseq, ret, node->nd_recv, lfinish, Qfalse);
 	    ADD_INSNL(ret, nd_line(node), branchunless, lfinish[1]);
 	    COMPILE(ret, "defined/recv", node->nd_recv);