diff --git a/checkin_notes b/checkin_notes
index abf35556e2..c6503502b0 100755
--- a/checkin_notes
+++ b/checkin_notes
@@ -1404,3 +1404,10 @@ David  30 Jan 2007
 
     clientgui/
         ViewProjectsGrid.cpp,h
+
+David  30 Jan 2007
+    - core client: computation of duration_correction_factor was messed up.
+        E.g. when the correct value is .5, it converges to sqrt(.5)
+
+    client/
+        client_types.C
diff --git a/client/client_types.C b/client/client_types.C
index 40b394ab2e..72bb8e3138 100644
--- a/client/client_types.C
+++ b/client/client_types.C
@@ -1742,7 +1742,7 @@ double RESULT::estimated_cpu_time_remaining() {
 // completion time for this project's results
 //
 void PROJECT::update_duration_correction_factor(RESULT* rp) {
-    double ratio = rp->final_cpu_time / rp->estimated_cpu_time();
+    double ratio = rp->final_cpu_time / rp->estimated_cpu_time_uncorrected();
 	double old_dcf = duration_correction_factor;
 
     // it's OK to overestimate completion time,
@@ -1751,7 +1751,7 @@ void PROJECT::update_duration_correction_factor(RESULT* rp) {
     // but decrease it with caution
     //
     if (ratio > 1) {
-        duration_correction_factor *= ratio;
+        duration_correction_factor = ratio;
     } else {
         // in particular, don't give much weight to results
         // that completed a lot earlier than expected