diff --git a/motorApp/MclennanSrc/devPM304.c b/motorApp/MclennanSrc/devPM304.c
index e8880b8d..7ac8f425 100644
--- a/motorApp/MclennanSrc/devPM304.c
+++ b/motorApp/MclennanSrc/devPM304.c
@@ -99,6 +99,7 @@ static int PM304_table[] = {
     IMMEDIATE,  /* SET_VELOCITY */
     IMMEDIATE,  /* SET_ACCEL */
     IMMEDIATE,  /* GO */
+    IMMEDIATE,  /* SET_ENC_RATIO */
     INFO,       /* GET_INFO */
     MOVE_TERM,  /* STOP_AXIS */
     VELOCITY,   /* JOG */
@@ -266,6 +267,12 @@ STATIC long PM304_build_trans(motor_cmnd command, double *parms, struct motorRec
          * does nothing
          */
         break;
+    case SET_ENC_RATIO:
+        /*
+         * The PM304 does not have the concept of encoder ratio, ignore this
+         * command
+         */
+        break;
     case GET_INFO:
         /* These commands are not actually done by sending a message, but
            rather they will indirectly cause the driver to read the status