diff --git a/app/render/backend/renderbackend.cpp b/app/render/backend/renderbackend.cpp
index e672da19a..caace5735 100644
--- a/app/render/backend/renderbackend.cpp
+++ b/app/render/backend/renderbackend.cpp
@@ -418,6 +418,11 @@ bool RenderBackend::ConformWaitInfo::operator==(const RenderBackend::ConformWait
       && rhs.affected_range == affected_range;
 }
 
+RenderBackend::RenderPool::RenderPool() :
+  queuer(0)
+{
+}
+
 void RenderBackend::RenderPool::Init(ViewerOutput* v)
 {
   foreach (RenderWorker* instance, instances) {
diff --git a/app/render/backend/renderbackend.h b/app/render/backend/renderbackend.h
index ced46478a..81568f9a0 100644
--- a/app/render/backend/renderbackend.h
+++ b/app/render/backend/renderbackend.h
@@ -83,6 +83,8 @@ protected:
 
 private:
   struct RenderPool {
+    RenderPool();
+
     QVector<RenderWorker*> instances;
     int queuer;
     QThreadPool threads;