diff --git a/site_ansto/instrument/server_config.tcl b/site_ansto/instrument/server_config.tcl
index d4a3230d..663fbea0 100644
--- a/site_ansto/instrument/server_config.tcl
+++ b/site_ansto/instrument/server_config.tcl
@@ -206,7 +206,7 @@ SicsDataPath lock
 ::utility::mkVar starttime Text user start true experiment true true
 ::utility::mkVar gumtree_version Text user gumtree_version true experiment true true
 ::utility::mkVar gumtree_status Text user gumtree_status true experiment true false
-::utility::mkVar gumtree_time_estimate float user gumtree_time_estimate true experiment true false
+::utility::mkVar gumtree_time_estimate Text user gumtree_time_estimate true experiment true false
 
 exe batchpath ../batch
 exe syspath ../batch