diff --git a/ref/Microsoft.Build/net/Microsoft.Build.cs b/ref/Microsoft.Build/net/Microsoft.Build.cs
index d59f83ba636..e41ba7954d4 100644
--- a/ref/Microsoft.Build/net/Microsoft.Build.cs
+++ b/ref/Microsoft.Build/net/Microsoft.Build.cs
@@ -1574,8 +1574,8 @@ protected GraphBuildOptions(Microsoft.Build.Graph.GraphBuildOptions original) {
         public virtual bool Equals(Microsoft.Build.Graph.GraphBuildOptions other) { throw null; }
         public override bool Equals(object obj) { throw null; }
         public override int GetHashCode() { throw null; }
-        public static bool operator ==(Microsoft.Build.Graph.GraphBuildOptions r1, Microsoft.Build.Graph.GraphBuildOptions r2) { throw null; }
-        public static bool operator !=(Microsoft.Build.Graph.GraphBuildOptions r1, Microsoft.Build.Graph.GraphBuildOptions r2) { throw null; }
+        public static bool operator ==(Microsoft.Build.Graph.GraphBuildOptions left, Microsoft.Build.Graph.GraphBuildOptions right) { throw null; }
+        public static bool operator !=(Microsoft.Build.Graph.GraphBuildOptions left, Microsoft.Build.Graph.GraphBuildOptions right) { throw null; }
         protected virtual bool PrintMembers(System.Text.StringBuilder builder) { throw null; }
         public override string ToString() { throw null; }
         public virtual Microsoft.Build.Graph.GraphBuildOptions <Clone>$() { throw null; }
diff --git a/ref/Microsoft.Build/netstandard/Microsoft.Build.cs b/ref/Microsoft.Build/netstandard/Microsoft.Build.cs
index ab3acb3d087..7b869bb79af 100644
--- a/ref/Microsoft.Build/netstandard/Microsoft.Build.cs
+++ b/ref/Microsoft.Build/netstandard/Microsoft.Build.cs
@@ -1568,8 +1568,8 @@ protected GraphBuildOptions(Microsoft.Build.Graph.GraphBuildOptions original) {
         public virtual bool Equals(Microsoft.Build.Graph.GraphBuildOptions other) { throw null; }
         public override bool Equals(object obj) { throw null; }
         public override int GetHashCode() { throw null; }
-        public static bool operator ==(Microsoft.Build.Graph.GraphBuildOptions r1, Microsoft.Build.Graph.GraphBuildOptions r2) { throw null; }
-        public static bool operator !=(Microsoft.Build.Graph.GraphBuildOptions r1, Microsoft.Build.Graph.GraphBuildOptions r2) { throw null; }
+        public static bool operator ==(Microsoft.Build.Graph.GraphBuildOptions left, Microsoft.Build.Graph.GraphBuildOptions right) { throw null; }
+        public static bool operator !=(Microsoft.Build.Graph.GraphBuildOptions left, Microsoft.Build.Graph.GraphBuildOptions right) { throw null; }
         protected virtual bool PrintMembers(System.Text.StringBuilder builder) { throw null; }
         public override string ToString() { throw null; }
         public virtual Microsoft.Build.Graph.GraphBuildOptions <Clone>$() { throw null; }
diff --git a/src/Shared/FileUtilities.cs b/src/Shared/FileUtilities.cs
index 707657933d1..1c50ccd6106 100644
--- a/src/Shared/FileUtilities.cs
+++ b/src/Shared/FileUtilities.cs
@@ -1078,7 +1078,12 @@ internal static string MakeRelative(string basePath, string path)
             {
                 sb.Append(splitPath[i]).Append(Path.DirectorySeparatorChar);
             }
-            sb.Length--;
+
+            if (fullPath[fullPath.Length - 1] != Path.DirectorySeparatorChar)
+            {
+                sb.Length--;
+            }
+
             return StringBuilderCache.GetStringAndRelease(sb);
         }
 
diff --git a/src/Shared/UnitTests/FileUtilities_Tests.cs b/src/Shared/UnitTests/FileUtilities_Tests.cs
index 7080a2e7ccc..fa6087dffe9 100644
--- a/src/Shared/UnitTests/FileUtilities_Tests.cs
+++ b/src/Shared/UnitTests/FileUtilities_Tests.cs
@@ -97,6 +97,24 @@ public void MakeRelativeTests()
                 Assert.Equal(@"\\host\path\file", FileUtilities.MakeRelative(@"c:\abc\def", @"\\host\path\file"));
                 Assert.Equal(@"\\host\d$\file", FileUtilities.MakeRelative(@"c:\abc\def", @"\\host\d$\file"));
                 Assert.Equal(@"..\fff\ggg.hh", FileUtilities.MakeRelative(@"c:\foo\bar\..\abc\cde", @"c:\foo\bar\..\abc\fff\ggg.hh"));
+
+                /* Directories */
+                Assert.Equal(@"def\", FileUtilities.MakeRelative(@"c:\abc\", @"c:\abc\def\"));
+                Assert.Equal(@"..\", FileUtilities.MakeRelative(@"c:\abc\def\xyz\", @"c:\abc\def\"));
+                Assert.Equal(@"..\ttt\", FileUtilities.MakeRelative(@"c:\abc\def\xyz\", @"c:\abc\def\ttt\"));
+                Assert.Equal(@".", FileUtilities.MakeRelative(@"c:\abc\def\", @"c:\abc\def\"));
+
+                /* Directory + File */
+                Assert.Equal(@"def", FileUtilities.MakeRelative(@"c:\abc\", @"c:\abc\def"));
+                Assert.Equal(@"..\..\ghi", FileUtilities.MakeRelative(@"c:\abc\def\xyz\", @"c:\abc\ghi"));
+                Assert.Equal(@"..\ghi", FileUtilities.MakeRelative(@"c:\abc\def\xyz\", @"c:\abc\def\ghi"));
+                Assert.Equal(@"..\ghi", FileUtilities.MakeRelative(@"c:\abc\def\", @"c:\abc\ghi"));
+
+                /* File + Directory */
+                Assert.Equal(@"def\", FileUtilities.MakeRelative(@"c:\abc", @"c:\abc\def\"));
+                Assert.Equal(@"..\", FileUtilities.MakeRelative(@"c:\abc\def\xyz", @"c:\abc\def\"));
+                Assert.Equal(@"..\ghi\", FileUtilities.MakeRelative(@"c:\abc\def\xyz", @"c:\abc\def\ghi\"));
+                Assert.Equal(@".", FileUtilities.MakeRelative(@"c:\abc\def", @"c:\abc\def\"));
             }
             else
             {
@@ -106,6 +124,25 @@ public void MakeRelativeTests()
                 Assert.Equal(@"../ttt/foo.cpp", FileUtilities.MakeRelative(@"/abc/def/xyz/", @"/abc/def/ttt/foo.cpp"));
                 Assert.Equal(@"foo.cpp", FileUtilities.MakeRelative(@"/abc/def", @"foo.cpp"));
                 Assert.Equal(@"../fff/ggg.hh", FileUtilities.MakeRelative(@"/foo/bar/../abc/cde", @"/foo/bar/../abc/fff/ggg.hh"));
+
+                /* Directories */
+                Assert.Equal(@"def/", FileUtilities.MakeRelative(@"/abc/", @"/abc/def/"));
+                Assert.Equal(@"../", FileUtilities.MakeRelative(@"/abc/def/xyz/", @"/abc/def/"));
+                Assert.Equal(@"../ttt/", FileUtilities.MakeRelative(@"/abc/def/xyz/", @"/abc/def/ttt/"));
+                Assert.Equal(@".", FileUtilities.MakeRelative(@"/abc/def/", @"/abc/def/"));
+
+                /* Directory + File */
+                Assert.Equal(@"def", FileUtilities.MakeRelative(@"/abc/", @"/abc/def"));
+                Assert.Equal(@"../../ghi", FileUtilities.MakeRelative(@"/abc/def/xyz/", @"/abc/ghi"));
+                Assert.Equal(@"../ghi", FileUtilities.MakeRelative(@"/abc/def/xyz/", @"/abc/def/ghi"));
+                Assert.Equal(@"../ghi", FileUtilities.MakeRelative(@"/abc/def/", @"/abc/ghi"));
+
+                /* File + Directory */
+                Assert.Equal(@"def/", FileUtilities.MakeRelative(@"/abc", @"/abc/def/"));
+                Assert.Equal(@"../", FileUtilities.MakeRelative(@"/abc/def/xyz", @"/abc/def/"));
+                Assert.Equal(@"../ghi/", FileUtilities.MakeRelative(@"/abc/def/xyz", @"/abc/def/ghi/"));
+                Assert.Equal(@".", FileUtilities.MakeRelative(@"/abc/def", @"/abc/def/"));
+
             }
         }