diff --git a/folly/dynamic-inl.h b/folly/dynamic-inl.h
index 2b3b2a49916..20a9473328e 100644
--- a/folly/dynamic-inl.h
+++ b/folly/dynamic-inl.h
@@ -134,16 +134,10 @@ struct FOLLY_EXPORT TypeError : std::runtime_error {
       const std::string& expected,
       dynamic::Type actual1,
       dynamic::Type actual2);
-  // TODO: noexcept calculation required through gcc-v4.9; remove once upgrading
-  // to gcc-v5.
-  TypeError(const TypeError&) noexcept(
-      std::is_nothrow_copy_constructible<std::runtime_error>::value);
-  TypeError& operator=(const TypeError&) noexcept(
-      std::is_nothrow_copy_assignable<std::runtime_error>::value);
-  TypeError(TypeError&&) noexcept(
-      std::is_nothrow_move_constructible<std::runtime_error>::value);
-  TypeError& operator=(TypeError&&) noexcept(
-      std::is_nothrow_move_assignable<std::runtime_error>::value);
+  TypeError(const TypeError&) noexcept;
+  TypeError& operator=(const TypeError&) noexcept;
+  TypeError(TypeError&&) noexcept;
+  TypeError& operator=(TypeError&&) noexcept;
   ~TypeError() override;
 };
 
diff --git a/folly/dynamic.cpp b/folly/dynamic.cpp
index db249b86f93..5c053cfefb6 100644
--- a/folly/dynamic.cpp
+++ b/folly/dynamic.cpp
@@ -63,14 +63,10 @@ TypeError::TypeError(
           dynamic::typeName(actual1),
           dynamic::typeName(actual2))) {}
 
-TypeError::TypeError(const TypeError&) noexcept(
-    std::is_nothrow_copy_constructible<std::runtime_error>::value) = default;
-TypeError& TypeError::operator=(const TypeError&) noexcept(
-    std::is_nothrow_copy_assignable<std::runtime_error>::value) = default;
-TypeError::TypeError(TypeError&&) noexcept(
-    std::is_nothrow_move_constructible<std::runtime_error>::value) = default;
-TypeError& TypeError::operator=(TypeError&&) noexcept(
-    std::is_nothrow_move_assignable<std::runtime_error>::value) = default;
+TypeError::TypeError(const TypeError&) noexcept = default;
+TypeError& TypeError::operator=(const TypeError&) noexcept = default;
+TypeError::TypeError(TypeError&&) noexcept = default;
+TypeError& TypeError::operator=(TypeError&&) noexcept = default;
 TypeError::~TypeError() = default;
 
 // This is a higher-order preprocessor macro to aid going from runtime