diff --git a/lib/miga/common.rb b/lib/miga/common.rb
index 280ebcd..1e139a3 100644
--- a/lib/miga/common.rb
+++ b/lib/miga/common.rb
@@ -64,11 +64,12 @@ def say(*par)
   # The report goes to $stderr iff --verbose
   def advance(step, n = 0, total = nil, bin = true)
     # Initialize advance timing
-    @_advance_time ||= { last: nil, n: 0, avg: nil }
-    if @_advance_time[:n] > n
+    @_advance_time ||= { last: nil, n: 0, avg: nil, total: total }
+    if @_advance_time[:n] > n || total != @_advance_time[:total]
       @_advance_time[:last] = nil
       @_advance_time[:n] = 0
       @_advance_time[:avg]  = nil
+      @_advance_time[:total] = total
     end
 
     # Estimate timing
diff --git a/test/common_test.rb b/test/common_test.rb
index c81f4e5..1543f40 100644
--- a/test/common_test.rb
+++ b/test/common_test.rb
@@ -76,23 +76,26 @@ def test_miga_name
   def test_advance
     m = MiGA::MiGA.new
 
-    # Check advance when missing total
+    # Check advance when missing total and n
     o = capture_stderr { m.advance('x', 0) }.string
     assert_match(%r{\] x *\r}, o)
 
+    # Check advance when missing total
+    o = capture_stderr { m.advance('x', 10) }.string
+    assert_match(%r{\] x 10 *\r}, o)
+
     # Initialize advance
     o = capture_stderr { m.advance('x', 0, 1001) }.string
     assert_match(%r{\] x 0\.0% \(0/1001\) *\r}, o)
 
     # Insufficient data for prediction
-    sleep(1)
     o = capture_stderr { m.advance('x', 1, 1000) }.string
     assert_match(%r{\] x 0\.1% \(1/1000\) *\r}, o)
 
     # Predict time
-    sleep(1)
-    o = capture_stderr { m.advance('x', 2, 1000) }.string
-    assert_match(%r{\] x 0\.2% \(2/1000\) 1\d\.\dm left *\r}, o)
+    sleep(1.01)
+    o = capture_stderr { m.advance('x', 4, 1000) }.string
+    assert_match(%r{\] x 0\.4% \(4/1000\) \d\.\dm left *\r}, o)
   end
 
   def test_num_suffix