diff --git a/HISTORY.rst b/HISTORY.rst
index efa87c51..804737ee 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -6,6 +6,12 @@ Release Notes
 PlatformIO 4.0
 --------------
 
+4.0.1 (2019-??-??)
+~~~~~~~~~~~~~~~~~~
+
+* Print `debug tool <http://docs.platformio.org/en/latest/plus/debugging.html#tools-debug-probes>`__ name for the active debugging session
+* Fixed an issue with incorrect escaping of Windows slashes when using `PIO Unified Debugger <http://docs.platformio.org/en/latest/plus/debugging.html>`__ and "piped" openOCD
+
 4.0.0 (2019-07-10)
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/platformio/commands/debug/client.py b/platformio/commands/debug/client.py
index ec0bb3d8..d17636c1 100644
--- a/platformio/commands/debug/client.py
+++ b/platformio/commands/debug/client.py
@@ -66,9 +66,9 @@ class GDBClient(BaseProcess):  # pylint: disable=too-many-instance-attributes
         self._kill_previous_session()
 
         patterns = {
-            "PROJECT_DIR": helpers.escape_path(self.project_dir),
-            "PROG_PATH": helpers.escape_path(prog_path),
-            "PROG_DIR": helpers.escape_path(dirname(prog_path)),
+            "PROJECT_DIR": self.project_dir,
+            "PROG_PATH": prog_path,
+            "PROG_DIR": dirname(prog_path),
             "PROG_NAME": basename(splitext(prog_path)[0]),
             "DEBUG_PORT": self.debug_options['port'],
             "UPLOAD_PROTOCOL": self.debug_options['upload_protocol'],
diff --git a/platformio/commands/debug/helpers.py b/platformio/commands/debug/helpers.py
index daaa8d93..fc7161bb 100644
--- a/platformio/commands/debug/helpers.py
+++ b/platformio/commands/debug/helpers.py
@@ -121,7 +121,7 @@ def validate_debug_options(cmd_ctx, env_options):
             cwd=server_package_dir if server_package else None,
             executable=tool_settings['server'].get("executable"),
             arguments=[
-                a.replace("$PACKAGE_DIR", escape_path(server_package_dir))
+                a.replace("$PACKAGE_DIR", server_package_dir)
                 if server_package_dir else a
                 for a in tool_settings['server'].get("arguments", [])
             ])
diff --git a/platformio/commands/debug/process.py b/platformio/commands/debug/process.py
index 98c7cc1a..f363ccb5 100644
--- a/platformio/commands/debug/process.py
+++ b/platformio/commands/debug/process.py
@@ -17,7 +17,6 @@ import signal
 import click
 from twisted.internet import protocol  # pylint: disable=import-error
 
-from platformio.commands.debug import helpers
 from platformio.compat import string_types
 from platformio.proc import get_pythonexe_path
 from platformio.project.helpers import get_project_core_dir
@@ -30,8 +29,8 @@ class BaseProcess(protocol.ProcessProtocol, object):
     STDOUT_CHUNK_SIZE = 2048
 
     COMMON_PATTERNS = {
-        "PLATFORMIO_HOME_DIR": helpers.escape_path(get_project_core_dir()),
-        "PLATFORMIO_CORE_DIR": helpers.escape_path(get_project_core_dir()),
+        "PLATFORMIO_HOME_DIR": get_project_core_dir(),
+        "PLATFORMIO_CORE_DIR": get_project_core_dir(),
         "PYTHONEXE": get_pythonexe_path()
     }
 
diff --git a/platformio/commands/debug/server.py b/platformio/commands/debug/server.py
index 83bba340..98f1e0e1 100644
--- a/platformio/commands/debug/server.py
+++ b/platformio/commands/debug/server.py
@@ -19,7 +19,6 @@ from twisted.internet import error  # pylint: disable=import-error
 from twisted.internet import reactor  # pylint: disable=import-error
 
 from platformio import exception, util
-from platformio.commands.debug import helpers
 from platformio.commands.debug.process import BaseProcess
 from platformio.proc import where_is_program
 
@@ -67,15 +66,15 @@ class DebugServer(BaseProcess):
         if openocd_pipe_allowed:
             args = []
             if server['cwd']:
-                args.extend(["-s", helpers.escape_path(server['cwd'])])
+                args.extend(["-s", server['cwd']])
             args.extend([
                 "-c", "gdb_port pipe; tcl_port disabled; telnet_port disabled"
             ])
             args.extend(server['arguments'])
             str_args = " ".join(
                 [arg if arg.startswith("-") else '"%s"' % arg for arg in args])
-            self._debug_port = '| "%s" %s' % (
-                helpers.escape_path(server_executable), str_args)
+            self._debug_port = '| "%s" %s' % (server_executable, str_args)
+            self._debug_port = self._debug_port.replace("\\", "\\\\")
         else:
             env = os.environ.copy()
             # prepend server "lib" folder to LD path