diff --git a/kdevplatform/language/duchain/functiondefinition.cpp b/kdevplatform/language/duchain/functiondefinition.cpp
--- a/kdevplatform/language/duchain/functiondefinition.cpp
+++ b/kdevplatform/language/duchain/functiondefinition.cpp
@@ -85,6 +85,10 @@
     return nullptr;
   }
 
+  if (decl->isFunctionDeclaration() && decl->isDefinition()) {
+    return const_cast<FunctionDefinition *>(static_cast<const FunctionDefinition *> (decl));
+  }
+
   const KDevVarLengthArray<IndexedDeclaration> allDefinitions = DUChain::definitions()->definitions(decl->id());
   for (const IndexedDeclaration decl : allDefinitions) {
     if(decl.data()) ///@todo Find better ways of deciding which definition to use
diff --git a/plugins/clang/tests/test_duchain.h b/plugins/clang/tests/test_duchain.h
--- a/plugins/clang/tests/test_duchain.h
+++ b/plugins/clang/tests/test_duchain.h
@@ -102,6 +102,8 @@
     void testQtIntegration();
     void testHasInclude();
 
+    void testSameFunctionDefinition();
+
 private:
     QScopedPointer<TestEnvironmentProvider> m_provider;
     KDevelop::TestProjectController* m_projectController;
diff --git a/plugins/clang/tests/test_duchain.cpp b/plugins/clang/tests/test_duchain.cpp
--- a/plugins/clang/tests/test_duchain.cpp
+++ b/plugins/clang/tests/test_duchain.cpp
@@ -2086,3 +2086,45 @@
         }
     }
 }
+
+void TestDUChain::testSameFunctionDefinition()
+{
+    QString source(QStringLiteral(R"(
+        #include <stdio.h>
+        #include <stdlib.h>
+
+        void configure()
+        {
+            printf("do stuff\n");
+        }
+    )"));
+
+    QTemporaryDir dir;
+    auto project = new TestProject(Path(dir.path()), this);
+    m_projectController->addProject(project);
+
+    TestFile file1(source, QStringLiteral("c"), project);
+    TestFile file2(source, QStringLiteral("c"), project);
+    TestFile file3(source, QStringLiteral("c"), project);
+
+    file1.parse(TopDUContext::AllDeclarationsContextsAndUses);
+    file2.parse(TopDUContext::AllDeclarationsContextsAndUses);
+    file3.parse(TopDUContext::AllDeclarationsContextsAndUses);
+
+    QVERIFY(file1.waitForParsed(1000));
+    QVERIFY(file2.waitForParsed(1000));
+    QVERIFY(file3.waitForParsed(1000));
+
+    auto checkFunctionDefinition = [] (TestFile & file) {
+        DUChainReadLocker lock;
+        QCOMPARE(file.topContext()->localDeclarations().count(), 1);
+        auto configureFunc = file.topContext()->localDeclarations().first();
+        QCOMPARE(FunctionDefinition::definition(configureFunc), configureFunc);
+    };
+
+    checkFunctionDefinition(file1);
+    checkFunctionDefinition(file2);
+    checkFunctionDefinition(file3);
+
+    m_projectController->closeAllProjects();
+}