diff --git a/src/google/protobuf/io/io_win32.cc b/src/google/protobuf/io/io_win32.cc
index 46e46e88d0..80e7c4e6cf 100755
--- a/src/google/protobuf/io/io_win32.cc
+++ b/src/google/protobuf/io/io_win32.cc
@@ -362,7 +362,7 @@ wstring testonly_utf8_to_winpath(const char* path) {
   return as_windows_path(path, &wpath) ? wpath : wstring();
 }
 
-int ExpandWildcards(
+ExpandWildcardsResult ExpandWildcards(
     const string& path, std::function<void(const string&)> consume) {
   if (path.find_first_of("*?") == string::npos) {
     // There are no wildcards in the path, we don't need to expand it.
@@ -392,7 +392,7 @@ int ExpandWildcards(
     dirname = path.substr(0, pos + 1);
   }
 
-  int matched = ExpandWildcardsResult::kErrorNoMatchingFile;
+  ExpandWildcardsResult matched = ExpandWildcardsResult::kErrorNoMatchingFile;
   do {
     // Ignore ".", "..", and directories.
     if ((metadata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0
@@ -430,7 +430,7 @@ int ExpandWildcards(
     dirname = path.substr(0, pos + 1);
   }
 
-  int matched = ExpandWildcardsResult::kErrorNoMatchingFile;
+  ExpandWildcardsResult matched = ExpandWildcardsResult::kErrorNoMatchingFile;
   do {
     // Ignore ".", "..", and directories.
     if ((metadata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0
diff --git a/src/google/protobuf/io/io_win32.h b/src/google/protobuf/io/io_win32.h
index 123fdb460b..775252b35b 100755
--- a/src/google/protobuf/io/io_win32.h
+++ b/src/google/protobuf/io/io_win32.h
@@ -76,13 +76,11 @@ PROTOBUF_EXPORT int stat(const char* path, struct _stat* buffer);
 PROTOBUF_EXPORT int write(int fd, const void* buffer, size_t size);
 PROTOBUF_EXPORT std::wstring testonly_utf8_to_winpath(const char* path);
 
-struct ExpandWildcardsResult {
-  enum {
-    kSuccess = 0,
-    kErrorNoMatchingFile = 1,
-    kErrorInputPathConversion = 2,
-    kErrorOutputPathConversion = 3,
-  };
+enum ExpandWildcardsResult {
+  kSuccess = 0,
+  kErrorNoMatchingFile = 1,
+  kErrorInputPathConversion = 2,
+  kErrorOutputPathConversion = 3,
 };
 
 // Expand wildcards in a path pattern, feed the result to a consumer function.
@@ -93,7 +91,7 @@ struct ExpandWildcardsResult {
 // `consume`. The resulting paths may not be absolute nor normalized.
 //
 // The function returns a value from `ExpandWildcardsResult`.
-LIBPROTOBUF_EXPORT int ExpandWildcards(
+LIBPROTOBUF_EXPORT ExpandWildcardsResult ExpandWildcards(
     const std::string& path, std::function<void(const std::string&)> consume);
 
 namespace strings {
diff --git a/src/google/protobuf/io/io_win32_unittest.cc b/src/google/protobuf/io/io_win32_unittest.cc
index cd7b127b9b..be2101e04c 100755
--- a/src/google/protobuf/io/io_win32_unittest.cc
+++ b/src/google/protobuf/io/io_win32_unittest.cc
@@ -429,7 +429,7 @@ TEST_F(IoWin32Test, ExpandWildcardsInRelativePathTest) {
   int found_b = 0;
   vector<string> found_bad;
   // Assert matching a relative path pattern. Results should also be relative.
-  int result = 
+  ExpandWildcardsResult result = 
       ExpandWildcards(
           string(kUtf8Text) + "\\foo*.proto",
           [&found_a, &found_b, &found_bad](const string& p) {
@@ -481,7 +481,7 @@ TEST_F(IoWin32Test, ExpandWildcardsInAbsolutePathTest) {
   vector<string> found_bad;
   // Assert matching an absolute path. The results should also use absolute
   // path.
-  int result = 
+  ExpandWildcardsResult result = 
       ExpandWildcards(
           string(test_tmpdir) + "\\" + kUtf8Text + "\\foo*.proto",
           [this, &found_a, &found_b, &found_bad](const string& p) {
@@ -544,7 +544,7 @@ TEST_F(IoWin32Test, ExpandWildcardsIgnoresDirectoriesTest) {
   vector<string> found_bad;
   // Assert that the pattern matches exactly the expected files, and using the
   // absolute path as did the input pattern.
-  int result = 
+  ExpandWildcardsResult result = 
       ExpandWildcards(
           string(kUtf8Text) + "\\foo*.proto",
           [&found_a, &found_c, &found_bad](const string& p) {
@@ -573,7 +573,7 @@ TEST_F(IoWin32Test, ExpandWildcardsFailsIfNoFileMatchesTest) {
   EXPECT_TRUE(SetCurrentDirectoryW(wtest_tmpdir.c_str()));
 
   // Control test: should match foo*.proto
-  int result = ExpandWildcards(
+  ExpandWildcardsResult result = ExpandWildcards(
       string(kUtf8Text) + "\\foo*.proto", [](const string&) {});
   EXPECT_EQ(result, ExpandWildcardsResult::kSuccess);