diff --git a/src/Experimental.h b/src/Experimental.h
index 225d2aa72..be391b59a 100644
--- a/src/Experimental.h
+++ b/src/Experimental.h
@@ -245,12 +245,6 @@
 // Easy change of keystroke bindings for menu items
 #define EXPERIMENTAL_EASY_CHANGE_KEY_BINDINGS
 
-// PRL 17 Mar 2018
-// Hoping to commit to use of this branch before 2.3.0 is out.
-// Don't use our own RingBuffer class, but reuse PortAudio's which includes
-// proper memory fences.
-#define EXPERIMENTAL_REWRITE_RING_BUFFER
-
 // PRL 1 Jun 2018
 #define EXPERIMENTAL_PUNCH_AND_ROLL
 
diff --git a/src/RingBuffer.cpp b/src/RingBuffer.cpp
index b9272be5a..de3eb08a5 100644
--- a/src/RingBuffer.cpp
+++ b/src/RingBuffer.cpp
@@ -23,45 +23,12 @@
 
 
 #include "RingBuffer.h"
-#include "Experimental.h"
-
-#undef REWRITE_RING_BUFFER
-
-// For now enabling the rewrite only for Mac
-
-#ifdef EXPERIMENTAL_REWRITE_RING_BUFFER
-#define REWRITE_RING_BUFFER
-#elif defined (__APPLE__)
-#define REWRITE_RING_BUFFER
-#endif
-
-namespace {
-   size_t roundUp(size_t n)
-   {
-#ifdef REWRITE_RING_BUFFER
-      // PaUtilRingBuffer requires a power of 2
-      if (n == 0)
-         return 1;
-
-      size_t prev = n;
-      for (size_t temp = n; temp != 0; prev = temp, temp = ((temp - 1) & temp))
-         ;
-      return prev == n ? prev : prev << 1;
-#else
-      return n;
-#endif
-   }
-}
 
 RingBuffer::RingBuffer(sampleFormat format, size_t size)
    : mFormat{ format }
-   , mBufferSize{ roundUp( std::max<size_t>(size, 64) ) }
+   , mBufferSize{ std::max<size_t>(size, 64) }
    , mBuffer{ mBufferSize, mFormat }
 {
-#ifdef REWRITE_RING_BUFFER
-   PaUtil_InitializeRingBuffer(
-      &mRingBuffer, SAMPLE_SIZE(format), mBufferSize, mBuffer.ptr() );
-#endif
 }
 
 RingBuffer::~RingBuffer()
@@ -70,11 +37,7 @@ RingBuffer::~RingBuffer()
 
 size_t RingBuffer::Len()
 {
-#ifdef REWRITE_RING_BUFFER
    return (mEnd + mBufferSize - mStart) % mBufferSize;
-#else
-   assert(false);
-#endif
 }
 
 //
@@ -83,19 +46,12 @@ size_t RingBuffer::Len()
 
 size_t RingBuffer::AvailForPut()
 {
-#ifdef REWRITE_RING_BUFFER
-   return PaUtil_GetRingBufferWriteAvailable(&mRingBuffer);
-#else
    return std::max<size_t>(mBufferSize - Len(), 4) - 4;
-#endif
 }
 
 size_t RingBuffer::Put(samplePtr buffer, sampleFormat format,
                     size_t samplesToCopy)
 {
-#ifdef REWRITE_RING_BUFFER
-   return PaUtil_WriteRingBuffer(&mRingBuffer, buffer, samplesToCopy);
-#else
    samplesToCopy = std::min( samplesToCopy, AvailForPut() );
    auto src = buffer;
    size_t copied = 0;
@@ -117,11 +73,8 @@ size_t RingBuffer::Put(samplePtr buffer, sampleFormat format,
    mEnd = pos;
 
    return copied;
-#endif
 }
 
-#if 0
-// not used
 size_t RingBuffer::Clear(sampleFormat format, size_t samplesToClear)
 {
    samplesToClear = std::min( samplesToClear, AvailForPut() );
@@ -142,7 +95,6 @@ size_t RingBuffer::Clear(sampleFormat format, size_t samplesToClear)
 
    return cleared;
 }
-#endif
 
 //
 // For the reader only:
@@ -150,19 +102,12 @@ size_t RingBuffer::Clear(sampleFormat format, size_t samplesToClear)
 
 size_t RingBuffer::AvailForGet()
 {
-#ifdef REWRITE_RING_BUFFER
-   return PaUtil_GetRingBufferReadAvailable(&mRingBuffer);
-#else
    return Len();
-#endif
 }
 
 size_t RingBuffer::Get(samplePtr buffer, sampleFormat format,
                        size_t samplesToCopy)
 {
-#ifdef REWRITE_RING_BUFFER
-   return PaUtil_ReadRingBuffer(&mRingBuffer, buffer, samplesToCopy);
-#else
    samplesToCopy = std::min( samplesToCopy, Len() );
    auto dest = buffer;
    size_t copied = 0;
@@ -181,17 +126,13 @@ size_t RingBuffer::Get(samplePtr buffer, sampleFormat format,
    }
 
    return copied;
-#endif
 }
 
 size_t RingBuffer::Discard(size_t samplesToDiscard)
 {
-#ifdef REWRITE_RING_BUFFER
-   PaUtil_AdvanceRingBufferReadIndex(&mRingBuffer, samplesToDiscard);
-#else
    samplesToDiscard = std::min( samplesToDiscard, Len() );
 
    mStart = (mStart + samplesToDiscard) % mBufferSize;
-#endif
+
    return samplesToDiscard;
 }
diff --git a/src/RingBuffer.h b/src/RingBuffer.h
index 4d72fde00..6fc19bd42 100644
--- a/src/RingBuffer.h
+++ b/src/RingBuffer.h
@@ -13,8 +13,6 @@
 
 #include "SampleFormat.h"
 
-#include "../lib-src/portaudio-v19/src/common/pa_ringbuffer.h"
-
 class RingBuffer {
  public:
    RingBuffer(sampleFormat format, size_t size);
@@ -26,7 +24,7 @@ class RingBuffer {
 
    size_t AvailForPut();
    size_t Put(samplePtr buffer, sampleFormat format, size_t samples);
-//   size_t Clear(sampleFormat format, size_t samples);
+   size_t Clear(sampleFormat format, size_t samples);
 
    //
    // For the reader only:
@@ -44,8 +42,6 @@ class RingBuffer {
    size_t        mEnd { 0 };
    size_t        mBufferSize;
    SampleBuffer  mBuffer;
-
-   PaUtilRingBuffer mRingBuffer;
 };
 
 #endif /*  __AUDACITY_RING_BUFFER__ */