diff --git a/llvm/runtime/libprofile/CommonProfiling.c b/llvm/runtime/libprofile/CommonProfiling.c
index 1c1771c3063e..210a5e5ab78a 100644
--- a/llvm/runtime/libprofile/CommonProfiling.c
+++ b/llvm/runtime/libprofile/CommonProfiling.c
@@ -19,7 +19,11 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <string.h>
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
 #include <unistd.h>
+#else
+#include <io.h>
+#endif
 #include <stdlib.h>
 
 static char *SavedArgs = 0;
diff --git a/llvm/runtime/libprofile/PathProfiling.c b/llvm/runtime/libprofile/PathProfiling.c
index 3008db9c4a60..161dfa0b2406 100644
--- a/llvm/runtime/libprofile/PathProfiling.c
+++ b/llvm/runtime/libprofile/PathProfiling.c
@@ -16,13 +16,21 @@
 #include "Profiling.h"
 #include "llvm/Analysis/ProfileInfoTypes.h"
 #include <sys/types.h>
-#include <unistd.h>
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
 #include <string.h>
 #include <stdlib.h>
-#include <unistd.h>
 #include <stdint.h>
 #include <stdio.h>
 
+// Must use __inline in Microsoft C
+#if defined(_MSC_VER)
+#define inline __inline
+#endif
+
 /* note that this is used for functions with large path counts,
          but it is unlikely those paths will ALL be executed */
 #define ARBITRARY_HASH_BIN_COUNT 100
@@ -215,7 +223,7 @@ void llvm_decrement_path_count (uint32_t functionNumber, uint32_t pathNumber) {
  *      +-----------------+-----------------+
  *
  */
-static void pathProfAtExitHandler() {
+static void pathProfAtExitHandler(void) {
   int outFile = getOutFile();
   uint32_t i;
   uint32_t header[2] = { PathInfo, 0 };