diff --git a/Cantera/src/ConstDensityThermo.h b/Cantera/src/ConstDensityThermo.h
index 4aa0a0ac7..1438ee5e9 100755
--- a/Cantera/src/ConstDensityThermo.h
+++ b/Cantera/src/ConstDensityThermo.h
@@ -167,7 +167,7 @@ namespace Cantera {
 
     protected:
 
-        int m_kk, m_mm;
+        int m_mm;
         doublereal m_tmin, m_tmax, m_p0;
 
         mutable doublereal     m_tlast;