diff --git a/include/nlohmann/detail/iterators/iter_impl.hpp b/include/nlohmann/detail/iterators/iter_impl.hpp
index 44448611a..22f3ffc39 100644
--- a/include/nlohmann/detail/iterators/iter_impl.hpp
+++ b/include/nlohmann/detail/iterators/iter_impl.hpp
@@ -88,8 +88,13 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
 
     iter_impl() = default;
     ~iter_impl() = default;
-    iter_impl(iter_impl&&) noexcept = default;
-    iter_impl& operator=(iter_impl&&) noexcept = default;
+    // the exception specification is left to be computed rather than declared:
+    // an array or object type whose iterator is not nothrow move constructible
+    // (std::deque's is not before libstdc++ 11) would make a declared noexcept
+    // differ from the implicit one, which deletes the function -- and is an
+    // error outright with older compilers
+    iter_impl(iter_impl&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor,cppcoreguidelines-noexcept-move-operations)
+    iter_impl& operator=(iter_impl&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor,cppcoreguidelines-noexcept-move-operations)
 
     /*!
     @brief constructor for a given JSON instance
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 84b6d1b12..73c9d4ec2 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -14764,8 +14764,13 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
 
     iter_impl() = default;
     ~iter_impl() = default;
-    iter_impl(iter_impl&&) noexcept = default;
-    iter_impl& operator=(iter_impl&&) noexcept = default;
+    // the exception specification is left to be computed rather than declared:
+    // an array or object type whose iterator is not nothrow move constructible
+    // (std::deque's is not before libstdc++ 11) would make a declared noexcept
+    // differ from the implicit one, which deletes the function -- and is an
+    // error outright with older compilers
+    iter_impl(iter_impl&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor,cppcoreguidelines-noexcept-move-operations)
+    iter_impl& operator=(iter_impl&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor,cppcoreguidelines-noexcept-move-operations)
 
     /*!
     @brief constructor for a given JSON instance
diff --git a/tests/src/unit-custom-array-type.cpp b/tests/src/unit-custom-array-type.cpp
index ddfdd04cb..1e25de188 100644
--- a/tests/src/unit-custom-array-type.cpp
+++ b/tests/src/unit-custom-array-type.cpp
@@ -14,6 +14,7 @@
 #include <map>
 #include <memory>
 #include <string>
+#include <type_traits>
 #include <vector>
 
 namespace
@@ -40,6 +41,19 @@ using no_at_json = nlohmann::basic_json<std::map, vector_without_at>;
 
 TEST_CASE("array type without capacity()")
 {
+    SECTION("the iterators of the default configuration stay nothrow movable")
+    {
+        // basic_json's iterators take their exception specification from the
+        // container iterators; std::deque's is not nothrow move constructible
+        // with older standard libraries, which must not cost the default
+        // configuration its noexcept
+        CHECK(std::is_nothrow_move_constructible<nlohmann::json::iterator>::value);
+        CHECK(std::is_nothrow_move_assignable<nlohmann::json::iterator>::value);
+        CHECK(std::is_nothrow_move_constructible<nlohmann::json::const_iterator>::value);
+        CHECK(std::is_move_constructible<deque_json::iterator>::value);
+        CHECK(std::is_move_assignable<deque_json::iterator>::value);
+    }
+
     SECTION("adding elements")
     {
         deque_json j = deque_json::array();