diff --git a/src/frontend/qt_sdl/EmuInstanceAudio.cpp b/src/frontend/qt_sdl/EmuInstanceAudio.cpp
index 4952d090..a4ac9394 100644
--- a/src/frontend/qt_sdl/EmuInstanceAudio.cpp
+++ b/src/frontend/qt_sdl/EmuInstanceAudio.cpp
@@ -330,7 +330,11 @@ void EmuInstance::micProcess()
                     micBufferReadPos += len;
                 }
 
-                if (len < kFrameLen)
+                if (len == 0)
+                {
+                    memset(tmp, 0, sizeof(tmp));
+                }
+                else if (len < kFrameLen)
                 {
                     for (int i = len; i < kFrameLen; i++)
                         tmp[i] = tmp[len-1];