diff --git a/duchain/expressionvisitor.cpp b/duchain/expressionvisitor.cpp
--- a/duchain/expressionvisitor.cpp
+++ b/duchain/expressionvisitor.cpp
@@ -226,6 +226,18 @@
         forever {
             AbstractType::Ptr type = parameterType(it->element, {}, m_editor, m_currentContext);
             closureType->addArgument(type);
+
+            if (it->element->parameterType && it->element->parameterType->objectType) {
+                NamespacedIdentifierAst* objectType = it->element->parameterType->objectType;
+                QualifiedIdentifier id = identifierForNamespace(objectType, m_editor);
+                DeclarationPointer dec = findDeclarationImport(ClassDeclarationType, id);
+
+                usingDeclaration(objectType->namespaceNameSequence->back()->element, dec);
+                buildNamespaceUses(objectType, id);
+            }
+            if (it->element->defaultValue) {
+                visitStaticScalar(it->element->defaultValue);
+            }
             if ( it->hasNext() ) {
                 it = it->next;
             } else {
diff --git a/duchain/tests/uses.h b/duchain/tests/uses.h
--- a/duchain/tests/uses.h
+++ b/duchain/tests/uses.h
@@ -81,6 +81,7 @@
     void useNamespace();
     void lateStatic();
     void closures();
+    void closureTypehints();
     void instanceof();
     void classNameString();
     void useTrait();
diff --git a/duchain/tests/uses.cpp b/duchain/tests/uses.cpp
--- a/duchain/tests/uses.cpp
+++ b/duchain/tests/uses.cpp
@@ -1067,6 +1067,18 @@
     QVERIFY(b->uses().isEmpty());
 }
 
+void TestUses::closureTypehints() {
+    TopDUContext* top = parse("<?php class A {} $b = function (A $a) {};", DumpNone);
+    QVERIFY(top);
+    DUChainReleaser releaseTop(top);
+    DUChainWriteLocker lock;
+
+    QCOMPARE(top->localDeclarations().count(), 3);
+    Declaration* a = top->localDeclarations().at(0);
+    QCOMPARE(a->qualifiedIdentifier(), QualifiedIdentifier("a"));
+    compareUses(a, QList<RangeInRevision>() << RangeInRevision(0, 32, 0, 33));
+}
+
 void TestUses::instanceof()
 {
     //                         0         1         2         3         4         5