diff --git a/reactos/subsystems/ntvdm/dos/dos32krnl/dos.c b/reactos/subsystems/ntvdm/dos/dos32krnl/dos.c
index b4c565f9f1a..a9aa39d6e52 100644
--- a/reactos/subsystems/ntvdm/dos/dos32krnl/dos.c
+++ b/reactos/subsystems/ntvdm/dos/dos32krnl/dos.c
@@ -915,6 +915,7 @@ DWORD DosLoadExecutable(IN DOS_EXEC_TYPE LoadType,
     PIMAGE_DOS_HEADER Header;
     PDWORD RelocationTable;
     PWORD RelocWord;
+    LPSTR CmdLinePtr = (LPSTR)CommandLine;
 
     DPRINT1("DosLoadExecutable(%d, %s, %s, %s, 0x%08X, 0x%08X)\n",
             LoadType,
@@ -931,8 +932,8 @@ DWORD DosLoadExecutable(IN DOS_EXEC_TYPE LoadType,
     }
 
     /* NULL-terminate the command line by removing the return carriage character */
-    while (*CommandLine && *CommandLine != '\r') CommandLine++;
-    *(LPSTR)CommandLine = '\0';
+    while (*CmdLinePtr && *CmdLinePtr != '\r') CmdLinePtr++;
+    *CmdLinePtr = '\0';
 
     /* Open a handle to the executable */
     FileHandle = CreateFileA(ExecutablePath,