diff --git a/setter/src/dos/dos.c b/setter/src/dos/dos.c
index 3a51a8f..a7de58d 100644
--- a/setter/src/dos/dos.c
+++ b/setter/src/dos/dos.c
@@ -28,7 +28,7 @@ Copyright (C) 2011-2021 Natalia Portillo
 #include <i86.h>
 #include <stdlib.h>
 #include <string.h>
-#elif defined(__TURBOC__) || defined(_MSC_VER)
+#elif defined(__TURBOC__) || defined(_MSC_VER) || defined(__ZTC__)
 #include <dos.h>
 #include <io.h>
 #include <stdlib.h>
@@ -43,7 +43,7 @@ Copyright (C) 2011-2021 Natalia Portillo
 
 unsigned int _dos_getdiskfree_ex(unsigned int drive, struct diskfree_ex_t* diskspace)
 {
-#if defined(__WATCOMC__) || defined(__TURBOC__) || defined(_MSC_VER)
+#if defined(__WATCOMC__) || defined(__TURBOC__) || defined(_MSC_VER) || defined(__ZTC__)
     char                  drivePath[4];
     union REGS            regs;
     struct SREGS          sregs;
diff --git a/setter/src/dos/dosdefs.h b/setter/src/dos/dosdefs.h
index 74bfc4d..20ada90 100644
--- a/setter/src/dos/dosdefs.h
+++ b/setter/src/dos/dosdefs.h
@@ -25,7 +25,7 @@ Copyright (C) 2011-2021 Natalia Portillo
 #ifndef AARU_FSTESTER_SETTER_SRC_DOS_H
 #define AARU_FSTESTER_SETTER_SRC_DOS_H
 
-#if defined(__WATCOMC__) || defined(_MSC_VER)
+#if defined(__WATCOMC__) || defined(_MSC_VER) || defined(__ZTC__)
 #include <direct.h>
 #define __dos_mkdir(path) mkdir(path)
 #elif defined(__DJGPP__)
@@ -52,6 +52,8 @@ Copyright (C) 2011-2021 Natalia Portillo
 #endif
 #elif defined(_MSC_VER) && _MSC_VER <= 800
 #pragma pack(1)
+#elif defined(__ZTC__)
+#pragma ZTC align 1
 #else
 #pragma pack(push, 1)
 #endif
@@ -81,6 +83,8 @@ unsigned int _dos_getdiskfree_ex(unsigned int drive, struct diskfree_ex_t* disks
 #endif
 #elif defined(_MSC_VER) && _MSC_VER <= 800
 #pragma pack()
+#elif defined(__ZTC__)
+#pragma ZTC align
 #else
 #pragma pack(pop)
 #endif