diff --git a/src/common/model/diagram_filter.h b/src/common/model/diagram_filter.h
index dce99da2..3a02db5b 100644
--- a/src/common/model/diagram_filter.h
+++ b/src/common/model/diagram_filter.h
@@ -165,9 +165,10 @@ struct subclass_filter : public filter_visitor {
 };
 
 struct relationship_filter : public filter_visitor {
-    relationship_filter(filter_t type, std::vector<std::string> relationships)
+    relationship_filter(
+        filter_t type, std::vector<relationship_t> relationships)
         : filter_visitor{type}
-        , relationships_{relationships}
+        , relationships_{std::move(relationships)}
     {
     }
 
@@ -178,19 +179,16 @@ struct relationship_filter : public filter_visitor {
             return {};
 
         return std::any_of(relationships_.begin(), relationships_.end(),
-            [&r](const auto &rel) {
-                bool res = to_string(r) == rel;
-                return res;
-            });
+            [&r](const auto &rel) { return r == rel; });
     }
 
-    std::vector<std::string> relationships_;
+    std::vector<relationship_t> relationships_;
 };
 
 struct scope_filter : public filter_visitor {
-    scope_filter(filter_t type, std::vector<std::string> scopes)
+    scope_filter(filter_t type, std::vector<scope_t> scopes)
         : filter_visitor{type}
-        , scopes_{scopes}
+        , scopes_{std::move(scopes)}
     {
     }
 
@@ -199,14 +197,11 @@ struct scope_filter : public filter_visitor {
         if (scopes_.empty())
             return {};
 
-        return std::any_of(
-            scopes_.begin(), scopes_.end(), [&s](const auto &rel) {
-                bool res = to_string(s) == rel;
-                return res;
-            });
+        return std::any_of(scopes_.begin(), scopes_.end(),
+            [&s](const auto &scope) { return s == scope; });
     }
 
-    std::vector<std::string> scopes_;
+    std::vector<scope_t> scopes_;
 };
 
 struct context_filter : public filter_visitor {
diff --git a/src/config/config.cc b/src/config/config.cc
index fea6b369..184113d9 100644
--- a/src/config/config.cc
+++ b/src/config/config.cc
@@ -151,6 +151,7 @@ template <> void append_value<plantuml>(plantuml &l, const plantuml &r)
 }
 
 namespace YAML {
+using clanguml::common::model::relationship_t;
 using clanguml::common::model::scope_t;
 using clanguml::config::class_diagram;
 using clanguml::config::config;
@@ -464,6 +465,53 @@ template <> struct convert<layout_hint> {
     }
 };
 
+//
+// config relationship_t decoder
+//
+template <> struct convert<relationship_t> {
+    static bool decode(const Node &node, relationship_t &rhs)
+    {
+        assert(node.Type() == NodeType::Scalar);
+
+        auto relationship_name = node.as<std::string>();
+        if (relationship_name == "extension" ||
+            relationship_name == "inheritance") {
+            rhs = relationship_t::kExtension;
+        }
+        else if (relationship_name == "composition") {
+            rhs = relationship_t::kComposition;
+        }
+        else if (relationship_name == "aggregation") {
+            rhs = relationship_t::kAggregation;
+        }
+        else if (relationship_name == "containment") {
+            rhs = relationship_t::kContainment;
+        }
+        else if (relationship_name == "ownership") {
+            rhs = relationship_t::kOwnership;
+        }
+        else if (relationship_name == "association") {
+            rhs = relationship_t::kAssociation;
+        }
+        else if (relationship_name == "instantiation") {
+            rhs = relationship_t::kInstantiation;
+        }
+        else if (relationship_name == "friendship") {
+            rhs = relationship_t::kFriendship;
+        }
+        else if (relationship_name == "dependency") {
+            rhs = relationship_t::kDependency;
+        }
+        else if (relationship_name == "none") {
+            rhs = relationship_t::kNone;
+        }
+        else
+            return false;
+
+        return true;
+    }
+};
+
 //
 // config Yaml decoder
 //
diff --git a/src/config/config.h b/src/config/config.h
index 089c45f5..482a52a4 100644
--- a/src/config/config.h
+++ b/src/config/config.h
@@ -51,16 +51,16 @@ struct filter {
     std::vector<std::string> elements;
 
     // E.g.:
-    //   - inheritance
+    //   - inheritance/extension
     //   - dependency
     //   - instantiation
-    std::vector<std::string> relationships;
+    std::vector<common::model::relationship_t> relationships;
 
     // E.g.:
     //   - public
     //   - protected
     //   - private
-    std::vector<std::string> scopes;
+    std::vector<common::model::scope_t> scopes;
 
     std::vector<std::string> subclasses;
 
diff --git a/tests/t00039/.clang-uml b/tests/t00039/.clang-uml
index 39881de4..b81fa27f 100644
--- a/tests/t00039/.clang-uml
+++ b/tests/t00039/.clang-uml
@@ -12,4 +12,4 @@ diagrams:
       subclasses:
         - clanguml::t00039::A
       relationships:
-        - extension
\ No newline at end of file
+        - inheritance
\ No newline at end of file