diff --git a/games/Doom64EX/files/patch-include_imp_util_Endian b/games/Doom64EX/files/patch-include_imp_util_Endian
index a071f8f6967d..f88c2e051505 100644
--- a/games/Doom64EX/files/patch-include_imp_util_Endian
+++ b/games/Doom64EX/files/patch-include_imp_util_Endian
@@ -1,38 +1,38 @@
 --- include/imp/util/Endian.orig	2018-08-24 09:23:34 UTC
 +++ include/imp/util/Endian
-@@ -10,7 +10,7 @@
- # define BIG_ENDIAN 0x1234
- # define LITTLE_ENDIAN 0x4321
+@@ -12,6 +12,8 @@
  # define BYTE_ORDER LITTLE_ENDIAN
--#elif defined(__APPLE__)
-+#elif defined(__APPLE__) || defined(__FreeBSD__)
+ #elif defined(__APPLE__)
  # include <machine/endian.h>
++#elif defined(__FreeBSD__)
++# include <sys/endian.h>
  #else
  # include <endian.h>
-@@ -57,6 +57,26 @@ namespace imp {
+ #endif
+@@ -57,6 +59,26 @@ namespace imp {
  
      inline uint64 swap_bytes(uint64 x) noexcept
      { return OSSwapInt64(x); }
 +}
 +#elif defined(__FreeBSD__)
 +namespace imp {
 +  inline int16 swap_bytes(int16 x) noexcept
 +  { return bswap16(x); }
 +
 +  inline uint16 swap_bytes(uint16 x) noexcept
 +  { return bswap16(x); }
 +
 +  inline int32 swap_bytes(int32 x) noexcept
 +  { return bswap32(x); }
 +
 +  inline uint32 swap_bytes(uint32 x) noexcept
 +  { return bswap32(x); }
 +
 +  inline int64 swap_bytes(int64 x) noexcept
 +  { return bswap64(x); }
 +
 +  inline uint64 swap_bytes(uint64 x) noexcept
 +  { return bswap64(x); }
  }
  #elif defined(__GNUC__) || defined(__clang__)
  namespace imp {