diff --git a/setter/src/dos/CMakeLists.txt b/setter/src/dos/CMakeLists.txt
index fd3a6e4..20dde7a 100644
--- a/setter/src/dos/CMakeLists.txt
+++ b/setter/src/dos/CMakeLists.txt
@@ -30,7 +30,7 @@ project(fssetter-dos
         DESCRIPTION "Filesystem test creator for DOS"
         LANGUAGES C)
 
-set(PLATFORM_SOURCES attr.c deleted.c dirdepth.c filename.c files.c frag.c links.c os.c perms.c rsrcfork.c sparse.c dostime.h time.c volume.c xattr.c dos.c attr.h dosuname.c dosuname.h dosdefs.h)
+set(PLATFORM_SOURCES attr.c deleted.c dirdepth.c filename.c files.c frag.c links.c os.c perms.c rsrcfork.c sparse.c dostime.h time.c volume.c xattr.c dos.c attr.h dosuname.c dosuname.h dosdefs.h djgpp.c)
 
 set(EXECUTABLE_NAME "fssetter")
 
diff --git a/setter/src/dos/djgpp.c b/setter/src/dos/djgpp.c
new file mode 100644
index 0000000..9bf0678
--- /dev/null
+++ b/setter/src/dos/djgpp.c
@@ -0,0 +1,72 @@
+/****************************************************************************
+Aaru Data Preservation Suite
+-----------------------------------------------------------------------------
+
+    Author(s)      : Natalia Portillo
+
+--[ License ] ---------------------------------------------------------------
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as
+     published by the Free Software Foundation, either version 3 of the
+     License, or (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+-----------------------------------------------------------------------------
+Copyright (C) 2011-2021 Natalia Portillo
+*****************************************************************************/
+
+#include <dpmi.h>
+#include <errno.h>
+#include <go32.h>
+#include <sys/movedata.h>
+
+#include "dosdefs.h"
+
+unsigned int _djgpp_getdiskfree_ex(unsigned int drive, struct diskfree_ex_t* diskspace)
+{
+    char        drivePath[4];
+    __dpmi_regs regs;
+
+    drivePath[0] = (drive & 0xFF) + '@';
+    drivePath[1] = ':';
+    drivePath[2] = '\\';
+    drivePath[3] = 0;
+
+    // Use transferBuffer[0] for drivePath and transferBuffer[16] for diskfree_ex_t
+    dosmemput(drivePath, 0, __tb);
+
+    regs.x.ax = 0x7303;
+    regs.x.ds = __tb >> 4;
+    regs.x.dx = __tb & 0x0F;
+    regs.x.es = (__tb + 16) >> 4;
+    regs.x.di = (__tb + 16) & 0x0F;
+    regs.x.cx = sizeof(struct diskfree_ex_t);
+
+    __dpmi_int(0x21, &regs);
+
+    if(regs.h.al == 0 && !(regs.x.flags & 1))
+    {
+        errno = ENOSYS;
+        return -1;
+    }
+    else if(regs.x.flags & 1)
+    {
+        errno     = EINVAL;
+        _doserrno = regs.x.ax;
+        return -1;
+    }
+
+    dosmemget(__tb + 16, sizeof(struct diskfree_ex_t), diskspace);
+
+    errno     = 0;
+    _doserrno = regs.x.ax;
+
+    return 0;
+}
diff --git a/setter/src/dos/dos.c b/setter/src/dos/dos.c
index a7de58d..3fe4c0f 100644
--- a/setter/src/dos/dos.c
+++ b/setter/src/dos/dos.c
@@ -33,10 +33,6 @@ Copyright (C) 2011-2021 Natalia Portillo
 #include <io.h>
 #include <stdlib.h>
 #include <string.h>
-#elif defined(__DJGPP__)
-#include <dpmi.h>
-#include <go32.h>
-#include <sys/movedata.h>
 #endif
 
 #include "dosdefs.h"
@@ -95,44 +91,7 @@ unsigned int _dos_getdiskfree_ex(unsigned int drive, struct diskfree_ex_t* disks
 
     return 0;
 #elif defined(__DJGPP__)
-    char        drivePath[4];
-    __dpmi_regs regs;
-
-    drivePath[0] = (drive & 0xFF) + '@';
-    drivePath[1] = ':';
-    drivePath[2] = '\\';
-    drivePath[3] = 0;
-
-    // Use transferBuffer[0] for drivePath and transferBuffer[16] for diskfree_ex_t
-    dosmemput(drivePath, 0, __tb);
-
-    regs.x.ax = 0x7303;
-    regs.x.ds = __tb >> 4;
-    regs.x.dx = __tb & 0x0F;
-    regs.x.es = (__tb + 16) >> 4;
-    regs.x.di = (__tb + 16) & 0x0F;
-    regs.x.cx = sizeof(struct diskfree_ex_t);
-
-    __dpmi_int(0x21, &regs);
-
-    if(regs.h.al == 0 && !(regs.x.flags & 1))
-    {
-        errno = ENOSYS;
-        return -1;
-    }
-    else if(regs.x.flags & 1)
-    {
-        errno     = EINVAL;
-        _doserrno = regs.x.ax;
-        return -1;
-    }
-
-    dosmemget(__tb + 16, sizeof(struct diskfree_ex_t), diskspace);
-
-    errno     = 0;
-    _doserrno = regs.x.ax;
-
-    return 0;
+    return _djgpp_getdiskfree_ex(drive, diskspace);
 #else
     errno = ENOSYS;
     return -1;
diff --git a/setter/src/dos/dosdefs.h b/setter/src/dos/dosdefs.h
index 20ada90..7de2946 100644
--- a/setter/src/dos/dosdefs.h
+++ b/setter/src/dos/dosdefs.h
@@ -75,6 +75,10 @@ typedef struct diskfree_ex_t
 
 unsigned int _dos_getdiskfree_ex(unsigned int drive, struct diskfree_ex_t* diskspace);
 
+#ifdef __DJGPP__
+unsigned int _djgpp_getdiskfree_ex(unsigned int drive, struct diskfree_ex_t* diskspace);
+#endif
+
 #if defined(__WATCOMC__)
 #if __WATCOMC__ >= 1100
 #pragma pack(__pop)