diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index c2e798659d..fb4af5d729 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -7362,6 +7362,12 @@ namespace ts {
                 }
                 return type;
             }
+            else if (operator === SyntaxKind.AmpersandAmpersandToken || operator === SyntaxKind.CommaToken) {
+                if (node === binaryExpression.right) {
+                    return getContextualType(binaryExpression);
+                }
+            }
+
             return undefined;
         }