diff --git a/ports/esp32/machine_bitstream.c b/ports/esp32/machine_bitstream.c
index a60fe1b1c5..9d2bb57246 100644
--- a/ports/esp32/machine_bitstream.c
+++ b/ports/esp32/machine_bitstream.c
@@ -69,13 +69,11 @@ void IRAM_ATTR machine_bitstream_high_low(mp_hal_pin_obj_t pin, uint32_t *timing
             GPIO_REG_WRITE(gpio_reg_set, pin_mask);
             uint32_t start_ticks = mp_hal_ticks_cpu();
             uint32_t *t = &timing_ns[b >> 6 & 2];
-            uint32_t end_ticks = start_ticks + t[0];
             while (mp_hal_ticks_cpu() - start_ticks < t[0]) {
                 ;
             }
             GPIO_REG_WRITE(gpio_reg_clear, pin_mask);
             b <<= 1;
-            end_ticks += t[1];
             while (mp_hal_ticks_cpu() - start_ticks < t[1]) {
                 ;
             }
diff --git a/ports/esp8266/machine_bitstream.c b/ports/esp8266/machine_bitstream.c
index bc16aea44d..13666f3d0f 100644
--- a/ports/esp8266/machine_bitstream.c
+++ b/ports/esp8266/machine_bitstream.c
@@ -57,13 +57,11 @@ void machine_bitstream_high_low(mp_hal_pin_obj_t pin, uint32_t *timing_ns, const
             GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pin_mask);
             uint32_t start_ticks = mp_hal_ticks_cpu();
             uint32_t *t = &timing_ns[b >> 6 & 2];
-            uint32_t end_ticks = start_ticks + t[0];
             while (mp_hal_ticks_cpu() - start_ticks < t[0]) {
                 ;
             }
             GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pin_mask);
             b <<= 1;
-            end_ticks += t[1];
             while (mp_hal_ticks_cpu() - start_ticks < t[1]) {
                 ;
             }