diff --git a/_test/or0.go b/_test/or0.go
new file mode 100644
index 000000000..765ebeec5
--- /dev/null
+++ b/_test/or0.go
@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	c := false
+	println(c || !c)
+}
+
+// Output:
+// true
diff --git a/_test/or1.go b/_test/or1.go
new file mode 100644
index 000000000..0dd73f8c3
--- /dev/null
+++ b/_test/or1.go
@@ -0,0 +1,9 @@
+package main
+
+func main() {
+	c := false
+	println(!c || c)
+}
+
+// Output:
+// true
diff --git a/interp/cfg.go b/interp/cfg.go
index 73a289de2..6d3652c49 100644
--- a/interp/cfg.go
+++ b/interp/cfg.go
@@ -1023,6 +1023,9 @@ func (interp *Interpreter) cfg(root *node) ([]*node, error) {
 			n.child[1].tnext = n
 			n.typ = n.child[0].typ
 			n.findex = sc.add(n.typ)
+			if n.start.action == aNop {
+				n.start.gen = branch
+			}
 
 		case lorExpr:
 			n.start = n.child[0].start
@@ -1031,6 +1034,9 @@ func (interp *Interpreter) cfg(root *node) ([]*node, error) {
 			n.child[1].tnext = n
 			n.typ = n.child[0].typ
 			n.findex = sc.add(n.typ)
+			if n.start.action == aNop {
+				n.start.gen = branch
+			}
 
 		case parenExpr:
 			wireChild(n)
diff --git a/interp/dot.go b/interp/dot.go
index 8696a7711..8441128ff 100644
--- a/interp/dot.go
+++ b/interp/dot.go
@@ -38,7 +38,7 @@ func (n *node) astDot(out io.Writer, name string) {
 func (n *node) cfgDot(out io.Writer) {
 	fmt.Fprintf(out, "digraph cfg {\n")
 	n.Walk(nil, func(n *node) {
-		if n.kind == basicLit || n.kind == identExpr || n.tnext == nil {
+		if n.kind == basicLit || n.tnext == nil {
 			return
 		}
 		var label string
diff --git a/interp/run.go b/interp/run.go
index 4ee7e1e93..d8b10b9f8 100644
--- a/interp/run.go
+++ b/interp/run.go
@@ -345,13 +345,16 @@ func not(n *node) {
 	dest := genValue(n)
 	value := genValue(n.child[0])
 	tnext := getExec(n.tnext)
+	i := n.findex
 
 	if n.fnext != nil {
 		fnext := getExec(n.fnext)
 		n.exec = func(f *frame) bltn {
 			if !value(f).Bool() {
+				f.data[i].SetBool(true)
 				return tnext
 			}
+			f.data[i].SetBool(false)
 			return fnext
 		}
 	} else {