diff --git a/R/R/prophet.R b/R/R/prophet.R
index 06d9c7c..c77dbf6 100644
--- a/R/R/prophet.R
+++ b/R/R/prophet.R
@@ -600,7 +600,7 @@ logistic_growth_init <- function(df) {
   # Initialize the offset
   m <- L0 * T / (L0 - L1)
   # And the rate
-  k <- L0 / m
+  k <- (L0 - L1) / T
   return(c(k, m))
 }
 
diff --git a/python/fbprophet/forecaster.py b/python/fbprophet/forecaster.py
index 58da58b..c4c550c 100644
--- a/python/fbprophet/forecaster.py
+++ b/python/fbprophet/forecaster.py
@@ -523,7 +523,7 @@ class Prophet(object):
         # Initialize the offset
         m = L0 * T / (L0 - L1)
         # And the rate
-        k = L0 / m
+        k = (L0 - L1) / T
         return (k, m)
 
     # fb-block 7