diff --git a/.travis.yml b/.travis.yml
index e81c40de91..16e48856e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,6 +33,7 @@ env:
   - TEST_PLATFORM="jgaurora_a5s_a1"
   - TEST_PLATFORM="STM32F103VE_longer"
   - TEST_PLATFORM="STM32F407VE_black"
+  - TEST_PLATFORM="mks_robin"
 
   # Put lengthy tests last
   - TEST_PLATFORM="LPC1768"
@@ -42,7 +43,6 @@ env:
   #- TEST_PLATFORM="at90usb1286_cdc"
   #- TEST_PLATFORM="at90usb1286_dfu"
   #- TEST_PLATFORM="STM32F103CB_malyan"
-  #- TEST_PLATFORM="mks_robin"
   #- TEST_PLATFORM="mks_robin_lite"
   #- TEST_PLATFORM="mks_robin_mini"
   #- TEST_PLATFORM="mks_robin_nano"
diff --git a/buildroot/share/PlatformIO/scripts/mks_robin.py b/buildroot/share/PlatformIO/scripts/mks_robin.py
index 742f4cd173..f3775d297e 100644
--- a/buildroot/share/PlatformIO/scripts/mks_robin.py
+++ b/buildroot/share/PlatformIO/scripts/mks_robin.py
@@ -10,6 +10,7 @@ env.Replace(LDSCRIPT_PATH="buildroot/share/PlatformIO/ldscripts/mks_robin.ld")
 # Encrypt ${PROGNAME}.bin and save it as 'Robin.bin'
 def encrypt(source, target, env):
     import os
+    import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]
 
@@ -22,6 +23,8 @@ def encrypt(source, target, env):
             byte = firmware.read(1)
             if position >= 320 and position < 31040:
                 byte = chr(ord(byte) ^ key[position & 31])
+                if sys.version_info[0] > 2:
+                    byte = bytes(byte, 'latin1')
             robin.write(byte)
             position += 1
     finally:
diff --git a/buildroot/share/PlatformIO/scripts/mks_robin_lite.py b/buildroot/share/PlatformIO/scripts/mks_robin_lite.py
index c11bbb37f6..95cb2a53ea 100644
--- a/buildroot/share/PlatformIO/scripts/mks_robin_lite.py
+++ b/buildroot/share/PlatformIO/scripts/mks_robin_lite.py
@@ -10,6 +10,7 @@ env.Replace(LDSCRIPT_PATH="buildroot/share/PlatformIO/ldscripts/mks_robin_lite.l
 # Encrypt ${PROGNAME}.bin and save it as 'mksLite.bin'
 def encrypt(source, target, env):
     import os
+    import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]
 
@@ -22,6 +23,8 @@ def encrypt(source, target, env):
             byte = firmware.read(1)
             if position >= 320 and position < 31040:
                 byte = chr(ord(byte) ^ key[position & 31])
+                if sys.version_info[0] > 2:
+                    byte = bytes(byte, 'latin1')
             robin.write(byte)
             position += 1
     finally:
diff --git a/buildroot/share/PlatformIO/scripts/mks_robin_mini.py b/buildroot/share/PlatformIO/scripts/mks_robin_mini.py
index 2b3ba6f90d..62b2091dd5 100755
--- a/buildroot/share/PlatformIO/scripts/mks_robin_mini.py
+++ b/buildroot/share/PlatformIO/scripts/mks_robin_mini.py
@@ -10,6 +10,7 @@ env.Replace(LDSCRIPT_PATH="buildroot/share/PlatformIO/ldscripts/mks_robin_mini.l
 # Encrypt ${PROGNAME}.bin and save it as 'Robin_mini.bin'
 def encrypt(source, target, env):
     import os
+    import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]
 
@@ -22,6 +23,8 @@ def encrypt(source, target, env):
             byte = firmware.read(1)
             if position >= 320 and position < 31040:
                 byte = chr(ord(byte) ^ key[position & 31])
+                if sys.version_info[0] > 2:
+                    byte = bytes(byte, 'latin1')
             robin.write(byte)
             position += 1
     finally:
diff --git a/buildroot/share/PlatformIO/scripts/mks_robin_nano.py b/buildroot/share/PlatformIO/scripts/mks_robin_nano.py
index eb8bca9b52..6a195fa089 100755
--- a/buildroot/share/PlatformIO/scripts/mks_robin_nano.py
+++ b/buildroot/share/PlatformIO/scripts/mks_robin_nano.py
@@ -10,6 +10,7 @@ env.Replace(LDSCRIPT_PATH="buildroot/share/PlatformIO/ldscripts/mks_robin_nano.l
 # Encrypt ${PROGNAME}.bin and save it as 'Robin_nano.bin'
 def encrypt(source, target, env):
     import os
+    import sys
 
     key = [0xA3, 0xBD, 0xAD, 0x0D, 0x41, 0x11, 0xBB, 0x8D, 0xDC, 0x80, 0x2D, 0xD0, 0xD2, 0xC4, 0x9B, 0x1E, 0x26, 0xEB, 0xE3, 0x33, 0x4A, 0x15, 0xE4, 0x0A, 0xB3, 0xB1, 0x3C, 0x93, 0xBB, 0xAF, 0xF7, 0x3E]
 
@@ -22,6 +23,8 @@ def encrypt(source, target, env):
             byte = firmware.read(1)
             if position >= 320 and position < 31040:
                 byte = chr(ord(byte) ^ key[position & 31])
+                if sys.version_info[0] > 2:
+                    byte = bytes(byte, 'latin1')
             robin.write(byte)
             position += 1
     finally: