diff --git a/include/llvm/Support/FileSystem.h b/include/llvm/Support/FileSystem.h
index 08727d7f79c..b660a5b1618 100644
--- a/include/llvm/Support/FileSystem.h
+++ b/include/llvm/Support/FileSystem.h
@@ -175,11 +175,11 @@ public:
   // getters
   file_type type() const { return Type; }
   perms permissions() const { return Perms; }
-  
+  TimeValue getLastModificationTime() const;
+
   // setters
   void type(file_type v) { Type = v; }
   void permissions(perms p) { Perms = p; }
-  TimeValue getLastModificationTime();
 };
 
 /// file_magic - An "enum class" enumeration of file types based on magic (the first
diff --git a/lib/Support/Unix/PathV2.inc b/lib/Support/Unix/PathV2.inc
index e9cb6e75627..4c76f28c66c 100644
--- a/lib/Support/Unix/PathV2.inc
+++ b/lib/Support/Unix/PathV2.inc
@@ -110,7 +110,7 @@ namespace llvm {
 namespace sys  {
 namespace fs {
 
-TimeValue file_status::getLastModificationTime() {
+TimeValue file_status::getLastModificationTime() const {
   TimeValue Ret;
   Ret.fromEpochTime(fs_st_mtime);
   return Ret;
diff --git a/lib/Support/Windows/PathV2.inc b/lib/Support/Windows/PathV2.inc
index 5e0375fcf9a..0c12bb440e8 100644
--- a/lib/Support/Windows/PathV2.inc
+++ b/lib/Support/Windows/PathV2.inc
@@ -128,7 +128,7 @@ namespace llvm {
 namespace sys  {
 namespace fs {
 
-TimeValue file_status::getLastModificationTime() {
+TimeValue file_status::getLastModificationTime() const {
   ULARGE_INTEGER UI;
   UI.LowPart = LastWriteTimeLow;
   UI.HighPart = LastWriteTimeHigh;