diff --git a/subsystems/ntvdm/dos.c b/subsystems/ntvdm/dos.c
index 86d5e3d0c2a..8ff155769aa 100644
--- a/subsystems/ntvdm/dos.c
+++ b/subsystems/ntvdm/dos.c
@@ -864,7 +864,7 @@ VOID DosInitializePsp(WORD PspSegment, LPCSTR CommandLine, WORD ProgramSize, WOR
     PspBlock->FarCall[2] = 0xCB; // retf
 
     /* Set the command line */
-    PspBlock->CommandLineSize = (BYTE)min(strlen(CommandLine), DOS_CMDLINE_LENGTH);
+    PspBlock->CommandLineSize = (BYTE)min(strlen(CommandLine), DOS_CMDLINE_LENGTH - 1);
     RtlCopyMemory(PspBlock->CommandLine, CommandLine, PspBlock->CommandLineSize);
     PspBlock->CommandLine[PspBlock->CommandLineSize] = '\r';
 }
@@ -875,7 +875,7 @@ BOOLEAN DosCreateProcess(LPCSTR CommandLine, WORD EnvBlock)
     HANDLE FileHandle = INVALID_HANDLE_VALUE, FileMapping = NULL;
     LPBYTE Address = NULL;
     LPSTR ProgramFilePath, Parameters[256];
-    CHAR CommandLineCopy[MAX_PATH];
+    CHAR CommandLineCopy[DOS_CMDLINE_LENGTH];
     INT ParamCount = 0;
     WORD Segment = 0;
     WORD MaxAllocSize;
diff --git a/subsystems/ntvdm/ntvdm.c b/subsystems/ntvdm/ntvdm.c
index bbb44d4bd4f..72123098c70 100644
--- a/subsystems/ntvdm/ntvdm.c
+++ b/subsystems/ntvdm/ntvdm.c
@@ -77,7 +77,7 @@ BOOL WINAPI ConsoleCtrlHandler(DWORD ControlType)
 INT wmain(INT argc, WCHAR *argv[])
 {
     INT i;
-    CHAR CommandLine[MAX_PATH];
+    CHAR CommandLine[DOS_CMDLINE_LENGTH];
     DWORD CurrentTickCount;
     DWORD LastTickCount = GetTickCount();
     DWORD Cycles = 0;