diff --git a/grbl/stepper.c b/grbl/stepper.c
index 8e0b151d..8f1eac19 100644
--- a/grbl/stepper.c
+++ b/grbl/stepper.c
@@ -103,6 +103,7 @@ typedef struct {
            counter_z;
   #ifdef STEP_PULSE_DELAY
     uint8_t step_bits;  // Stores out_bits output to complete the step pulse delay
+    uint8_t step_bits_dual;
   #endif
 
   uint8_t execute_step;     // Flags step execution for each interrupt.