diff --git a/add_to_path.cmd b/add_to_path.cmd
index 61f15bf..d905f01 100644
--- a/add_to_path.cmd
+++ b/add_to_path.cmd
@@ -10,9 +10,13 @@ SETLOCAL EnableDelayedExpansion
 NET SESSION >nul 2>&1
 IF %ERRORLEVEL% EQU 0 (
 	for /d %%d in (*.*) do (
-		set value=%MYDIR%%%d
-		echo Adding !value! to system PATH
-		reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v Path /t REG_EXPAND_SZ /d "%value%" /f
+		rem grab current value
+		for /f "tokens=1,2*" %a in ('reg query "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v path') do set currentValue=%c
+		rem concat previous and new value
+		set value=%currentValue%;%MYDIR%%%d
+		rem write back new value
+		reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v Path /t REG_EXPAND_SZ /d "%value%" /f 2>nul
+		echo Added !value! to system PATH
 	)
 ) ELSE (
     ECHO You need to run this script as Administrator