diff --git a/plugins/quickopen/duchainitemquickopen.cpp b/plugins/quickopen/duchainitemquickopen.cpp
--- a/plugins/quickopen/duchainitemquickopen.cpp
+++ b/plugins/quickopen/duchainitemquickopen.cpp
@@ -160,7 +160,11 @@
         return false;
     }
 
-    if (m_openDefinition && FunctionDefinition::definition(decl)) {
+    if (m_openDefinition &&
+        // only look for definitions if we don't already have a FunctionDefinition
+        !(decl->isFunctionDeclaration() && decl->isDefinition()) &&
+        FunctionDefinition::definition(decl)) {
+
         decl = FunctionDefinition::definition(decl);
     }