diff --git a/iceoryx_hoofs/test/moduletests/test_vocabulary_expected.cpp b/iceoryx_hoofs/test/moduletests/test_vocabulary_expected.cpp
index dee0408b5d..4e86f29551 100644
--- a/iceoryx_hoofs/test/moduletests/test_vocabulary_expected.cpp
+++ b/iceoryx_hoofs/test/moduletests/test_vocabulary_expected.cpp
@@ -546,7 +546,7 @@ TEST_F(expected_test, ExpectedWithValueConvertsToOptionalWithValue)
     ::testing::Test::RecordProperty("TEST_ID", "a877f9bd-5793-437f-8dee-a109aed9f647");
     constexpr int VALUE = 4711;
     expected<int, TestError> sut{success<int>(VALUE)};
-    iox::optional<int> value = sut.to_optional();
+    optional<int> value = sut.to_optional();
 
     ASSERT_THAT(value.has_value(), Eq(true));
     EXPECT_THAT(*value, Eq(VALUE));
@@ -556,7 +556,7 @@ TEST_F(expected_test, ExpectedWithErrorConvertsToOptionalWithoutValue)
 {
     ::testing::Test::RecordProperty("TEST_ID", "fe161275-8fa2-43c9-86e7-0a20d79eb44f");
     expected<int, TestError> sut{error<TestError>(TestError::ERROR1)};
-    iox::optional<int> value = sut.to_optional();
+    optional<int> value = sut.to_optional();
 
     ASSERT_THAT(value.has_value(), Eq(false));
 }
diff --git a/iceoryx_hoofs/vocabulary/include/iox/detail/expected.inl b/iceoryx_hoofs/vocabulary/include/iox/detail/expected.inl
index 1838edc07c..46368e810e 100644
--- a/iceoryx_hoofs/vocabulary/include/iox/detail/expected.inl
+++ b/iceoryx_hoofs/vocabulary/include/iox/detail/expected.inl
@@ -23,18 +23,6 @@ namespace iox
 {
 // AXIVION Next Construct AutosarC++19_03-A12.1.5 : This is a false positive since there is no fitting constructor
 // available for delegation
-namespace internal
-{
-template <typename... T>
-struct IsOptional : std::false_type
-{
-};
-template <typename T>
-struct IsOptional<iox::optional<T>> : std::true_type
-{
-};
-} // namespace internal
-
 template <typename T>
 inline success<T>::success(const T& t) noexcept
     : value(t)
diff --git a/iceoryx_hoofs/vocabulary/include/iox/expected.hpp b/iceoryx_hoofs/vocabulary/include/iox/expected.hpp
index e855b92410..970c146a72 100644
--- a/iceoryx_hoofs/vocabulary/include/iox/expected.hpp
+++ b/iceoryx_hoofs/vocabulary/include/iox/expected.hpp
@@ -27,13 +27,6 @@
 
 namespace iox
 {
-namespace internal
-{
-/// @brief Type trait which verifies whether the passed type T is of type optional
-template <typename...>
-struct IsOptional;
-} // namespace internal
-
 /// @brief helper struct to create an expected which is signalling success more easily
 /// @param T type which the success helper class should contain
 /// @code
diff --git a/iceoryx_posh/include/iceoryx_posh/capro/service_description.hpp b/iceoryx_posh/include/iceoryx_posh/capro/service_description.hpp
index 90190963fe..72dd9167c1 100644
--- a/iceoryx_posh/include/iceoryx_posh/capro/service_description.hpp
+++ b/iceoryx_posh/include/iceoryx_posh/capro/service_description.hpp
@@ -22,6 +22,7 @@
 #include "iceoryx_hoofs/log/logstream.hpp"
 #include "iceoryx_posh/iceoryx_posh_types.hpp"
 #include "iox/expected.hpp"
+#include "iox/optional.hpp"
 #include "iox/string.hpp"
 
 #include <cstdint>