diff --git a/include/polarssl/dhm.h b/include/polarssl/dhm.h
index 75dff19..4665ff9 100644
--- a/include/polarssl/dhm.h
+++ b/include/polarssl/dhm.h
@@ -152,7 +152,7 @@
     mpi RP;     /*!<  cached R^2 mod P  */
     mpi Vi;     /*!<  blinding value    */
     mpi Vf;     /*!<  un-blinding value */
-    mpi _X;     /*!<  previous X        */
+    mpi pX;     /*!<  previous X        */
 }
 dhm_context;