diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 8e57b5f6..d72dd59c 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -24,6 +24,7 @@ lib_xua Change Log
   * ADDED:     Ability to read or modify bcdDevice
   * ADDED:     Override USB descriptor with sampling frequency and
     bit-resolution set at boot time.
+  * ADDED:     Global pointer to allow external access to masterClockFreq
 
 0.2.1
 -----
diff --git a/lib_xua/src/core/buffer/ep/ep_buffer.xc b/lib_xua/src/core/buffer/ep/ep_buffer.xc
index ae58ef83..2093502f 100644
--- a/lib_xua/src/core/buffer/ep/ep_buffer.xc
+++ b/lib_xua/src/core/buffer/ep/ep_buffer.xc
@@ -182,6 +182,8 @@ void XUA_Buffer(
     }
 }
 
+// Allows us to externally modify masterClockFreq
+unsafe{volatile unsigned * unsafe masterClockFreq_ptr;}
 
 /**
  * Buffers data from audio endpoints
@@ -268,6 +270,8 @@ void XUA_Buffer_Ep(register chanend c_aud_out,
     unsigned masterClockFreq = DEFAULT_MCLK_FREQ;
     unsigned lastClock = 0;
 
+    unsafe{masterClockFreq_ptr = &masterClockFreq;}
+
     unsigned clocks = 0;
     long long clockcounter = 0;