--- a/gfx/layers/ipc/ShadowLayers.cpp
+++ b/gfx/layers/ipc/ShadowLayers.cpp
@@ -212,18 +212,16 @@ FixedSizeSmallShmemSectionAllocator::Fix
 : mShmProvider(aShmProvider)
 {
   MOZ_ASSERT(mShmProvider);
 }
 
 FixedSizeSmallShmemSectionAllocator::~FixedSizeSmallShmemSectionAllocator()
 {
   ShrinkShmemSectionHeap();
-  // Check if we're not leaking..
-  MOZ_ASSERT(mUsedShmems.empty());
 }
 
 bool
 FixedSizeSmallShmemSectionAllocator::AllocShmemSection(uint32_t aSize, ShmemSection* aShmemSection)
 {
   // For now we only support sizes of 4. If we want to support different sizes
   // some more complicated bookkeeping should be added.
   MOZ_ASSERT(aSize == sSupportedBlockSize);