diff --git a/src/plugins/valgrind/callgrind/callgrindfunctioncycle.cpp b/src/plugins/valgrind/callgrind/callgrindfunctioncycle.cpp
index 72db30dd2c6..5eb1f57072e 100644
--- a/src/plugins/valgrind/callgrind/callgrindfunctioncycle.cpp
+++ b/src/plugins/valgrind/callgrind/callgrindfunctioncycle.cpp
@@ -67,7 +67,7 @@ FunctionCycle::~FunctionCycle()
     // d should be deleted by Function::~Function()
 }
 
-void FunctionCycle::setFunctions(const QVector<const Function *> functions)
+void FunctionCycle::setFunctions(const QVector<const Function *> &functions)
 {
     Private *d = CYCLE_D;
 
diff --git a/src/plugins/valgrind/callgrind/callgrindfunctioncycle.h b/src/plugins/valgrind/callgrind/callgrindfunctioncycle.h
index 39b92e5ae78..c184090200e 100644
--- a/src/plugins/valgrind/callgrind/callgrindfunctioncycle.h
+++ b/src/plugins/valgrind/callgrind/callgrindfunctioncycle.h
@@ -51,7 +51,7 @@ public:
 
     /// sets the list of functions that make up this cycle
     /// NOTE: ownership is *not* transferred to the cycle
-    void setFunctions(const QVector<const Function *> functions);
+    void setFunctions(const QVector<const Function *> &functions);
     /// @return the functions that make up this cycle
     QVector<const Function *> functions() const;