diff --git a/fvgp/gpMCMC.py b/fvgp/gpMCMC.py
index bb2c769..2cc204f 100644
--- a/fvgp/gpMCMC.py
+++ b/fvgp/gpMCMC.py
@@ -215,7 +215,7 @@ def __init__(self,
                  indices,
                  proposal_dist="normal",
                  init_prop_Sigma=None,
-                 adapt_callable="normal",
+                 adapt_callable=None,
                  r_opt=.234,
                  c_0=10,
                  c_1=.8,