diff --git a/include/llvm-c/Core.h b/include/llvm-c/Core.h
index f155b0dbf26..093c89ae997 100644
--- a/include/llvm-c/Core.h
+++ b/include/llvm-c/Core.h
@@ -2580,6 +2580,7 @@ LLVMMemoryBufferRef LLVMCreateMemoryBufferWithMemoryRangeCopy(const char *InputD
                                                               size_t InputDataLength,
                                                               const char *BufferName);
 const char* LLVMGetBufferStart(LLVMMemoryBufferRef MemBuf);
+size_t LLVMGetBufferSize(LLVMMemoryBufferRef MemBuf);
 void LLVMDisposeMemoryBuffer(LLVMMemoryBufferRef MemBuf);
 
 /**
diff --git a/lib/IR/Core.cpp b/lib/IR/Core.cpp
index e0f76d30dac..50d1aaaff8f 100644
--- a/lib/IR/Core.cpp
+++ b/lib/IR/Core.cpp
@@ -2459,6 +2459,10 @@ const char* LLVMGetBufferStart(LLVMMemoryBufferRef MemBuf) {
   return unwrap(MemBuf)->getBufferStart();
 }
 
+size_t LLVMGetBufferSize(LLVMMemoryBufferRef MemBuf) {
+  return unwrap(MemBuf)->getBufferSize();
+}
+
 void LLVMDisposeMemoryBuffer(LLVMMemoryBufferRef MemBuf) {
   delete unwrap(MemBuf);
 }