diff --git a/Buildings/ThermalZones/Detailed/BaseClasses/CFDExchange.mo b/Buildings/ThermalZones/Detailed/BaseClasses/CFDExchange.mo
index 1d67adc1401..91740b58d64 100644
--- a/Buildings/ThermalZones/Detailed/BaseClasses/CFDExchange.mo
+++ b/Buildings/ThermalZones/Detailed/BaseClasses/CFDExchange.mo
@@ -20,7 +20,6 @@ extends Buildings.ThermalZones.Detailed.BaseClasses.PartialExchange;
     assert(A[i] > 0, "Surface must be bigger than zero.");
   end for;
 
-  Modelica.Utilities.Streams.print(string="Start cosimulation");
   coSimFlag := cfdStartCosimulation(
       cfdFilNam,
       name,
diff --git a/Buildings/ThermalZones/Detailed/BaseClasses/ISATExchange.mo b/Buildings/ThermalZones/Detailed/BaseClasses/ISATExchange.mo
index 3f3ef7a83b0..bb0d6ce1b1b 100644
--- a/Buildings/ThermalZones/Detailed/BaseClasses/ISATExchange.mo
+++ b/Buildings/ThermalZones/Detailed/BaseClasses/ISATExchange.mo
@@ -19,7 +19,6 @@ block ISATExchange "Block that exchanges data with the ISAT code"
     assert(A[i] > 0, "Surface must be bigger than zero.");
   end for;
 
-  Modelica.Utilities.Streams.print(string="Start cosimulation");
   coSimFlag := isatStartCosimulation(
       cfdFilNam,
       name,