diff --git a/src/transport/MultiTransport.cpp b/src/transport/MultiTransport.cpp
index b09cb9e00..3904cfb30 100644
--- a/src/transport/MultiTransport.cpp
+++ b/src/transport/MultiTransport.cpp
@@ -541,8 +541,6 @@ void MultiTransport::updateThermal_T()
      *       Chemkin has traditionally subtracted 1.5 here (SAND86-8246).
      *       The original Dixon-Lewis paper subtracted 1.5 here.
      */
-    const vector_fp& cp = ((IdealGasPhase*)m_thermo)->cp_R_ref();
-
     vector_fp cp_R_all(m_thermo->nSpecies());
     m_thermo->getCp_R_ref(&cp_R_all[0]);
     const vector_fp& cp = cp_R_all;