diff --git a/src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_StringInterpolation.cs b/src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_StringInterpolation.cs
index 0dd84820bcf7a..b3400bc60f2b0 100644
--- a/src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_StringInterpolation.cs
+++ b/src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_StringInterpolation.cs
@@ -64,7 +64,13 @@ private void MakeInterpolatedStringFormat(BoundInterpolatedString node, out Boun
                         formatString.Builder.Append(":").Append(fillin.Format.ConstantValue.StringValue);
                     }
                     formatString.Builder.Append("}");
-                    expressions.Add(fillin.Value); // NOTE: must still be lowered
+                    var value = fillin.Value;
+                    if (value.Type?.TypeKind == TypeKind.Dynamic)
+                    {
+                        value = MakeConversion(value, _compilation.ObjectType, @checked: false);
+                    }
+
+                    expressions.Add(value); // NOTE: must still be lowered
                 }
             }
 
diff --git a/src/Compilers/CSharp/Test/Semantic/Semantics/InterpolationTests.cs b/src/Compilers/CSharp/Test/Semantic/Semantics/InterpolationTests.cs
index 2b39efdc87c46..30f5cb2724ad1 100644
--- a/src/Compilers/CSharp/Test/Semantic/Semantics/InterpolationTests.cs
+++ b/src/Compilers/CSharp/Test/Semantic/Semantics/InterpolationTests.cs
@@ -248,6 +248,30 @@ static void Main(string[] args)
             CompileAndVerify(source, expectedOutput: expectedOutput);
         }
 
+        [Fact, WorkItem(306), WorkItem(308)]
+        public void DynamicInterpolation()
+        {
+            string source =
+@"using System;
+using System.Linq.Expressions;
+class Program
+{
+    static void Main(string[] args)
+    {
+        dynamic nil = null;
+        dynamic a = new string[] {""Hello"", ""world""};
+        Console.WriteLine($""<{nil}>"");
+        Console.WriteLine($""<{a}>"");
+    }
+    Expression<Func<string>> M(dynamic d) {
+        return () => $""Dynamic: {d}"";
+    }
+}";
+            string expectedOutput = @"<>
+<System.String[]>";
+            var verifier = CompileAndVerify(source, new[] { SystemCoreRef, CSharpRef }, expectedOutput: expectedOutput).VerifyDiagnostics();
+        }
+
         [Fact]
         public void UnclosedInterpolation01()
         {