diff --git a/src/MDI/fix_mdi_qm.h b/src/MDI/fix_mdi_qm.h
index 19343ed4af..9e7c6f5789 100644
--- a/src/MDI/fix_mdi_qm.h
+++ b/src/MDI/fix_mdi_qm.h
@@ -59,7 +59,6 @@ class FixMDIQM : public Fix {
   double lmp2mdi_energy, mdi2lmp_energy;
   double lmp2mdi_force, mdi2lmp_force;
   double lmp2mdi_pressure, mdi2lmp_pressure;
-  double lmp2mdi_velocity, mdi2lmp_velocity;
 
   // buffers for MDI comm