diff --git a/nordicsemi/dfu/dfu_transport_serial.py b/nordicsemi/dfu/dfu_transport_serial.py
index 61a34aa..589abad 100644
--- a/nordicsemi/dfu/dfu_transport_serial.py
+++ b/nordicsemi/dfu/dfu_transport_serial.py
@@ -219,7 +219,10 @@ def progress_percentage(part, whole):
             # After 8 frames (4096 Bytes), nrf5x will erase and write to flash. While erasing/writing to flash
             # nrf5x's CPU is blocked. We better wait a few ms, just to be safe
             if count%8 == 0:
-                time.sleep(0.010)
+                time.sleep(DfuTransportSerial.FLASH_PAGE_WRITE_TIME)
+
+        # Wait for last page to write
+        time.sleep(DfuTransportSerial.FLASH_PAGE_WRITE_TIME)
 
         # Send data stop packet
         frame = int32_to_bytes(DFU_STOP_DATA_PACKET)
diff --git a/nordicsemi/version.py b/nordicsemi/version.py
index d353bae..d0d077a 100644
--- a/nordicsemi/version.py
+++ b/nordicsemi/version.py
@@ -30,4 +30,4 @@
 
 """ Version definition for nrfutil. """
 
-NRFUTIL_VERSION = "0.5.3.post11"
+NRFUTIL_VERSION = "0.5.3.post12"