diff --git a/include/SDL3/SDL_rwops.h b/include/SDL3/SDL_rwops.h
index 27e1f316a3..6f6c3c013c 100644
--- a/include/SDL3/SDL_rwops.h
+++ b/include/SDL3/SDL_rwops.h
@@ -954,7 +954,22 @@ extern DECLSPEC SDL_bool SDLCALL SDL_WriteS64LE(SDL_RWops *dst, Sint64 value);
  */
 extern DECLSPEC SDL_bool SDLCALL SDL_WriteU64BE(SDL_RWops *dst, Uint64 value);
 
-extern DECLSPEC SDL_bool SDLCALL SDL_WriteU64BE(SDL_RWops *dst, Uint64 value);
+/**
+ * Use this function to write 64 bits in native format to an SDL_RWops as
+ * big-endian data.
+ *
+ * SDL byteswaps the data only if necessary, so the application always
+ * specifies native format, and the data written will be in big-endian format.
+ *
+ * \param dst the stream to which data will be written
+ * \param value the data to be written, in native format
+ * \returns SDL_TRUE on successful write, SDL_FALSE on failure; call
+ *          SDL_GetError() for more information.
+ *
+ * \since This function is available since SDL 3.0.0.
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_WriteS64BE(SDL_RWops *dst, Sint64 value);
+
 /* @} *//* Write endian functions */
 
 /* Ends C function definitions when using C++ */
diff --git a/src/dynapi/SDL_dynapi.sym b/src/dynapi/SDL_dynapi.sym
index 800e2d15ff..87f5a0a5d2 100644
--- a/src/dynapi/SDL_dynapi.sym
+++ b/src/dynapi/SDL_dynapi.sym
@@ -899,6 +899,7 @@ SDL3_0.0.0 {
     SDL_WriteS32LE;
     SDL_WriteS32BE;
     SDL_WriteS64LE;
+    SDL_WriteS64BE;
     # extra symbols go here (don't modify this line)
   local: *;
 };
diff --git a/src/dynapi/SDL_dynapi_overrides.h b/src/dynapi/SDL_dynapi_overrides.h
index 4d3d2510a9..7d9c0613b7 100644
--- a/src/dynapi/SDL_dynapi_overrides.h
+++ b/src/dynapi/SDL_dynapi_overrides.h
@@ -924,3 +924,4 @@
 #define SDL_WriteS32LE SDL_WriteS32LE_REAL
 #define SDL_WriteS32BE SDL_WriteS32BE_REAL
 #define SDL_WriteS64LE SDL_WriteS64LE_REAL
+#define SDL_WriteS64BE SDL_WriteS64BE_REAL
diff --git a/src/dynapi/SDL_dynapi_procs.h b/src/dynapi/SDL_dynapi_procs.h
index a8a4c1e462..6268b558fc 100644
--- a/src/dynapi/SDL_dynapi_procs.h
+++ b/src/dynapi/SDL_dynapi_procs.h
@@ -968,3 +968,4 @@ SDL_DYNAPI_PROC(SDL_bool,SDL_WriteS16BE,(SDL_RWops *a, Sint16 b),(a,b),return)
 SDL_DYNAPI_PROC(SDL_bool,SDL_WriteS32LE,(SDL_RWops *a, Sint32 b),(a,b),return)
 SDL_DYNAPI_PROC(SDL_bool,SDL_WriteS32BE,(SDL_RWops *a, Sint32 b),(a,b),return)
 SDL_DYNAPI_PROC(SDL_bool,SDL_WriteS64LE,(SDL_RWops *a, Sint64 b),(a,b),return)
+SDL_DYNAPI_PROC(SDL_bool,SDL_WriteS64BE,(SDL_RWops *a, Sint64 b),(a,b),return)