diff --git a/compiler-rt/lib/profile/InstrProfilingBuffer.c b/compiler-rt/lib/profile/InstrProfilingBuffer.c
--- a/compiler-rt/lib/profile/InstrProfilingBuffer.c
+++ b/compiler-rt/lib/profile/InstrProfilingBuffer.c
@@ -126,13 +126,3 @@
   initBufferWriter(&BufferWriter, Buffer);
   return lprofWriteData(&BufferWriter, 0, 0);
 }
-
-COMPILER_RT_VISIBILITY int __llvm_profile_write_buffer_internal(
-    char *Buffer, const __llvm_profile_data *DataBegin,
-    const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
-    const uint64_t *CountersEnd, const char *NamesBegin, const char *NamesEnd) {
-  ProfDataWriter BufferWriter;
-  initBufferWriter(&BufferWriter, Buffer);
-  return lprofWriteDataImpl(&BufferWriter, DataBegin, DataEnd, CountersBegin,
-                            CountersEnd, 0, NamesBegin, NamesEnd, 0);
-}
diff --git a/compiler-rt/lib/profile/InstrProfilingInternal.h b/compiler-rt/lib/profile/InstrProfilingInternal.h
--- a/compiler-rt/lib/profile/InstrProfilingInternal.h
+++ b/compiler-rt/lib/profile/InstrProfilingInternal.h
@@ -24,20 +24,6 @@
     const uint64_t *CountersBegin, const uint64_t *CountersEnd,
     const char *NamesBegin, const char *NamesEnd);
 
-/*!
- * \brief Write instrumentation data to the given buffer, given explicit
- * pointers to the live data in memory.  This function is probably not what you
- * want.  Use __llvm_profile_write_buffer instead.  Use this function if your
- * program has a custom memory layout.
- *
- * \pre \c Buffer is the start of a buffer at least as big as \a
- * __llvm_profile_get_size_for_buffer_internal().
- */
-int __llvm_profile_write_buffer_internal(
-    char *Buffer, const __llvm_profile_data *DataBegin,
-    const __llvm_profile_data *DataEnd, const uint64_t *CountersBegin,
-    const uint64_t *CountersEnd, const char *NamesBegin, const char *NamesEnd);
-
 /*!
  * The data structure describing the data to be written by the
  * low level writer callback function.