diff --git a/src/FDM/JSBSim/FGPiston.cpp b/src/FDM/JSBSim/FGPiston.cpp
index 9b0e5070c..cdafc5e98 100644
--- a/src/FDM/JSBSim/FGPiston.cpp
+++ b/src/FDM/JSBSim/FGPiston.cpp
@@ -459,7 +459,8 @@ void FGPiston::doCHT(void)
     
   double HeatCapacityCylinderHead = CpCylinderHead * MassCylinderHead;
     
-  CylinderHeadTemp_degK += dqdt_cylinder_head / HeatCapacityCylinderHead;
+  CylinderHeadTemp_degK +=
+    (dqdt_cylinder_head / HeatCapacityCylinderHead) * dt;
 }
 
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