diff --git a/script/copy_firmware.py b/script/copy_firmware.py
index 0b2cbb6..6d1d89d 100644
--- a/script/copy_firmware.py
+++ b/script/copy_firmware.py
@@ -11,13 +11,13 @@ def after_build(source, target, env):
     print( "Executing custom step " )
     dir    = env.GetLaunchDir()
     name   = env.get( "PIOENV" )
-    source = dir + "\\.pio\\build\\" + name + "\\firmware.bin"
+    source = dir + "/.pio/build/" + name + "/firmware.bin"
     if name == "gravity-debug" :
-        target = dir + "\\bin\\firmware-debug.bin"
+        target = dir + "/bin/firmware-debug.bin"
     if name == "gravity-release" :
-        target = dir + "\\bin\\firmware.bin"
+        target = dir + "/bin/firmware.bin"
     if name == "gravity-perf" :
-        target = dir + "\\bin\\firmware-perf.bin"
+        target = dir + "/bin/firmware-perf.bin"
     print( "Copy file : " + source + " -> " + target )
     shutil.copyfile( source, target )
 
diff --git a/script/copy_html.py b/script/copy_html.py
index c0fcc11..f5e8fb8 100644
--- a/script/copy_html.py
+++ b/script/copy_html.py
@@ -1,5 +1,5 @@
 Import("env")
-import shutil
+import shutil, os
 
 print( "Executing custom step " )
 dir    = env.GetLaunchDir()
@@ -7,6 +7,7 @@ source = dir + "/html/"
 target = dir + "/data/"
 print( "Copy html-files from " + source + " -> " + target )
 
+os.makedirs(os.path.dirname( target ), exist_ok=True)
 file = "about.min.htm"
 print( "Copy file: " + source + file + "->" + target + file)
 shutil.copyfile( source + file, target + file )