diff --git a/lib/model/progressemitter.go b/lib/model/progressemitter.go
index 0e961257b..9c35b0af8 100755
--- a/lib/model/progressemitter.go
+++ b/lib/model/progressemitter.go
@@ -190,6 +190,9 @@ func (t *ProgressEmitter) CommitConfiguration(from, to config.Configuration) boo
 	defer t.mut.Unlock()
 
 	t.interval = time.Duration(to.Options.ProgressUpdateIntervalS) * time.Second
+	if t.interval < time.Second {
+		t.interval = time.Second
+	}
 	t.minBlocks = to.Options.TempIndexMinBlocks
 	l.Debugln("progress emitter: updated interval", t.interval)
 
diff --git a/lib/model/progressemitter_test.go b/lib/model/progressemitter_test.go
index 731c84aa8..595d12873 100644
--- a/lib/model/progressemitter_test.go
+++ b/lib/model/progressemitter_test.go
@@ -60,6 +60,7 @@ func TestProgressEmitter(t *testing.T) {
 
 	p := NewProgressEmitter(c)
 	go p.Serve()
+	p.interval = 0
 
 	expectTimeout(w, t)