diff --git a/Source/JavaScriptCore/heap/IncrementalSweeper.cpp b/Source/JavaScriptCore/heap/IncrementalSweeper.cpp
index da15137..b3ad8c8 100644
--- a/Source/JavaScriptCore/heap/IncrementalSweeper.cpp
+++ b/Source/JavaScriptCore/heap/IncrementalSweeper.cpp
@@ -60,6 +60,12 @@ void IncrementalSweeper::cancelTimer()
     CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade);
 }

+void IncrementalSweeper::fullSweep()
+{
+  while (hasWork())
+      doWork();
+}
+
 void IncrementalSweeper::doWork()
 {
     doSweep(WTF::monotonicallyIncreasingTime());
diff --git a/Source/JavaScriptCore/heap/IncrementalSweeper.h b/Source/JavaScriptCore/heap/IncrementalSweeper.h
index af826c4..199f948 100644
--- a/Source/JavaScriptCore/heap/IncrementalSweeper.h
+++ b/Source/JavaScriptCore/heap/IncrementalSweeper.h
@@ -38,6 +38,7 @@ class IncrementalSweeper : public HeapTimer {
 public:
 #if USE(CF)
     JS_EXPORT_PRIVATE IncrementalSweeper(Heap*, CFRunLoopRef);
+    JS_EXPORT_PRIVATE void fullSweep();
 #else
     explicit IncrementalSweeper(VM*);
 #endif
@@ -52,6 +53,7 @@ private:
     void doSweep(double startTime);
     void scheduleTimer();
     void cancelTimer();
+    bool hasWork() const { return !m_blocksToSweep.isEmpty(); }

     unsigned m_currentBlockToSweepIndex;
     Vector<MarkedBlock*>& m_blocksToSweep;
diff --git a/Source/WebCore/platform/cocoa/MemoryPressureHandlerCocoa.mm b/Source/WebCore/platform/cocoa/MemoryPressureHandlerCocoa.mm
index 17858c44e..c85dca3 100644
--- a/Source/WebCore/platform/cocoa/MemoryPressureHandlerCocoa.mm
+++ b/Source/WebCore/platform/cocoa/MemoryPressureHandlerCocoa.mm
@@ -30,9 +30,11 @@
 #import "IOSurfacePool.h"
 #import "GCController.h"
 #import "JSDOMWindowBase.h"
+#import "JSDOMWindow.h"
 #import "LayerPool.h"
 #import "Logging.h"
 #import "WebCoreSystemInterface.h"
+#import <JavaScriptCore/IncrementalSweeper.h>
 #import <mach/mach.h>
 #import <mach/task_info.h>
 #import <malloc/malloc.h>
@@ -88,6 +90,13 @@ void MemoryPressureHandler::platformReleaseMemory(bool critical)
         ReliefLogger log("Collecting JavaScript garbage");
         gcController().garbageCollectNow();
     }
+
+    // Do a full sweep of collected objects.
+    {
+        ReliefLogger log("Full JavaScript garbage sweep");
+        JSC::JSLockHolder lock(JSDOMWindow::commonVM());
+        JSDOMWindow::commonVM().heap.sweeper()->fullSweep();
+    }
 #endif
 }