diff --git a/src/main.cpp b/src/main.cpp
index e70e664f..4c8e6435 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -30,6 +30,7 @@
 #include "mygetopt.h"
 #include "file.h"
 #include "packer.h"
+#include "p_elf.h"
 
 
 #if 1 && defined(__DJGPP__)
@@ -737,6 +738,18 @@ static int do_option(int optc, const char *arg)
     case 665:
         opt->o_unix.make_ptinterp = true;
         break;
+    case 666:  // Linux
+        opt->o_unix.osabi0 = 0;  // Elf32_Ehdr::ELFOSABI_LINUX
+        break;
+    case 667:  // FreeBSD
+        opt->o_unix.osabi0 = Elf32_Ehdr::ELFOSABI_FREEBSD;
+        break;
+    case 668:  // NetBSD
+        opt->o_unix.osabi0 = Elf32_Ehdr::ELFOSABI_NETBSD;
+        break;
+    case 669:  // OpenBSD
+        opt->o_unix.osabi0 = Elf32_Ehdr::ELFOSABI_OPENBSD;
+        break;
     case 670:
         opt->ps1_exe.boot_only = true;
         break;
@@ -864,6 +877,10 @@ static const struct mfx_option longopts[] =
     {"is_ptinterp",         0, 0, 663},     // linux/elf386 PT_INTERP program
     {"use_ptinterp",        0, 0, 664},     // linux/elf386 PT_INTERP program
     {"make_ptinterp",       0, 0, 665},     // linux/elf386 PT_INTERP program
+    {"Linux",               0, 0, 666},
+    {"FreeBSD",             0, 0, 667},
+    {"NetBSD",              0, 0, 668},
+    {"OpenBSD",             0, 0, 669},
     // watcom/le
     {"le",                  0, 0, 620},     // produce LE output
     // win32/pe
diff --git a/src/options.h b/src/options.h
index 5b7d5c00..ce67d4c4 100644
--- a/src/options.h
+++ b/src/options.h
@@ -146,6 +146,7 @@ struct options_t {
         bool is_ptinterp;           // is PT_INTERP, so don't adjust auxv_t
         bool use_ptinterp;          // use PT_INTERP /opt/upx/run
         bool make_ptinterp;         // make PT_INTERP [ignore current file!]
+        unsigned char osabi0;       // replacement if 0==.e_ident[EI_OSABI]
         enum { SCRIPT_MAX = 32 };
         const char *script_name;
     } o_unix;
diff --git a/src/p_elf.h b/src/p_elf.h
index 6330cc28..8ee1ad09 100644
--- a/src/p_elf.h
+++ b/src/p_elf.h
@@ -72,8 +72,10 @@ struct Ehdr
     };
     enum { // e_ident[EI_OSABI]
         ELFOSABI_NONE = 0,
+        ELFOSABI_NETBSD = 2,
         ELFOSABI_LINUX = 3,
         ELFOSABI_FREEBSD = 9,
+        ELFOSABI_OPENBSD = 12,
         ELFOSABI_ARM = 97
     };
     enum { // e_type
diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
index 6d8b93d0..117ee062 100644
--- a/src/p_lx_elf.cpp
+++ b/src/p_lx_elf.cpp
@@ -50,11 +50,15 @@ int
 PackLinuxElf32::checkEhdr(Elf32_Ehdr const *ehdr) const
 {
     const unsigned char * const buf = ehdr->e_ident;
+    unsigned osabi0 = buf[Elf32_Ehdr::EI_OSABI];
+    if (0==osabi0) {
+        osabi0 = opt->o_unix.osabi0;
+    }
 
     if (0!=memcmp(buf, "\x7f\x45\x4c\x46", 4)  // "\177ELF"
     ||  buf[Elf32_Ehdr::EI_CLASS]!=ei_class
     ||  buf[Elf32_Ehdr::EI_DATA] !=ei_data
-    ||  buf[Elf32_Ehdr::EI_OSABI] !=ei_osabi
+    ||                     osabi0!=ei_osabi
     ) {
         return -1;
     }
@@ -1874,13 +1878,39 @@ PackBSDElf32x86::PackBSDElf32x86(InputFile *f) : super(f)
     e_machine = Elf32_Ehdr::EM_386;
     ei_class  = Elf32_Ehdr::ELFCLASS32;
     ei_data   = Elf32_Ehdr::ELFDATA2LSB;
-    ei_osabi  = Elf32_Ehdr::ELFOSABI_FREEBSD;
 }
 
 PackBSDElf32x86::~PackBSDElf32x86()
 {
 }
 
+PackFreeBSDElf32x86::PackFreeBSDElf32x86(InputFile *f) : super(f)
+{
+    ei_osabi  = Elf32_Ehdr::ELFOSABI_FREEBSD;
+}
+
+PackFreeBSDElf32x86::~PackFreeBSDElf32x86()
+{
+}
+
+PackNetBSDElf32x86::PackNetBSDElf32x86(InputFile *f) : super(f)
+{
+    ei_osabi  = Elf32_Ehdr::ELFOSABI_NETBSD;
+}
+
+PackNetBSDElf32x86::~PackNetBSDElf32x86()
+{
+}
+
+PackOpenBSDElf32x86::PackOpenBSDElf32x86(InputFile *f) : super(f)
+{
+    ei_osabi  = Elf32_Ehdr::ELFOSABI_OPENBSD;
+}
+
+PackOpenBSDElf32x86::~PackOpenBSDElf32x86()
+{
+}
+
 int const *
 PackLinuxElf32x86::getFilters() const
 {
diff --git a/src/p_lx_elf.h b/src/p_lx_elf.h
index 3b44c0bb..dfe7bd40 100644
--- a/src/p_lx_elf.h
+++ b/src/p_lx_elf.h
@@ -342,6 +342,30 @@ protected:
     virtual int buildLoader(const Filter *);
 };
 
+class PackFreeBSDElf32x86 : public PackBSDElf32x86
+{
+    typedef PackBSDElf32x86 super;
+public:
+    PackFreeBSDElf32x86(InputFile *f);
+    virtual ~PackFreeBSDElf32x86();
+};
+
+class PackNetBSDElf32x86 : public PackBSDElf32x86
+{
+    typedef PackBSDElf32x86 super;
+public:
+    PackNetBSDElf32x86(InputFile *f);
+    virtual ~PackNetBSDElf32x86();
+};
+
+class PackOpenBSDElf32x86 : public PackBSDElf32x86
+{
+    typedef PackBSDElf32x86 super;
+public:
+    PackOpenBSDElf32x86(InputFile *f);
+    virtual ~PackOpenBSDElf32x86();
+};
+
 /*************************************************************************
 // linux/elfarm
 **************************************************************************/
diff --git a/src/packmast.cpp b/src/packmast.cpp
index 0157e043..3dee7c76 100644
--- a/src/packmast.cpp
+++ b/src/packmast.cpp
@@ -213,7 +213,11 @@ static Packer* try_packers(InputFile *f, try_function func)
             if ((p = func(new PackLinuxElf32x86interp(f),f)) != NULL)
                 return p;
         }
-        if ((p = func(new PackBSDElf32x86(f),f)) != NULL)
+        if ((p = func(new PackFreeBSDElf32x86(f),f)) != NULL)
+            return p;
+        if ((p = func(new PackNetBSDElf32x86(f),f)) != NULL)
+            return p;
+        if ((p = func(new PackOpenBSDElf32x86(f),f)) != NULL)
             return p;
         if ((p = func(new PackLinuxElf32x86(f),f)) != NULL)
             return p;