--- a/gfx/layers/basic/BasicLayersImpl.cpp
+++ b/gfx/layers/basic/BasicLayersImpl.cpp
@@ -165,16 +165,17 @@ FillRectWithMask(DrawTarget* aDT,
     SourceSurfaceRecording* ss = static_cast<SourceSurfaceRecording*>(aSurface);
     DrawEventRecorderMemory* mr = static_cast<DrawEventRecorderMemory*>(ss->mRecorder.get());
 
     size_t size = mr->RecordingSize();
     char* buffer = new char[size];
     mr->CopyRecording(buffer, size);
     std::istringstream recording(std::string(buffer, size));
 
+    delete [] buffer;
     translator->TranslateRecording(recording);
 
     aDT->SetTransform(oldTransform);
     aDT->PopClip();
     return;
   }
 
   aDT->FillRect(aRect,