diff --git a/Audio/Output/OutputAVFoundation.m b/Audio/Output/OutputAVFoundation.m
index e4d157228..412b696c9 100644
--- a/Audio/Output/OutputAVFoundation.m
+++ b/Audio/Output/OutputAVFoundation.m
@@ -180,16 +180,17 @@ static OSStatus eqRenderCallback(void *inRefCon, AudioUnitRenderActionFlags *ioA
 				int samplesProcessed;
 				size_t totalDone = 0;
 				size_t inDone = 0;
+				size_t visFrameCount = frameCount;
 				{
 					[currentPtsLock lock];
-					samplesProcessed = (int)r8bstate_resample(r8bvis, &visAudio[totalDone], frameCount, &inDone, &visTemp[0], 8192);
+					samplesProcessed = (int)r8bstate_resample(r8bvis, &visAudio[totalDone], visFrameCount, &inDone, &visTemp[0], 8192);
 					[currentPtsLock unlock];
 					if(samplesProcessed) {
 						[visController postVisPCM:&visTemp[0] amount:samplesProcessed];
 					}
 					totalDone += inDone;
-					frameCount -= inDone;
-				} while(samplesProcessed && frameCount);
+					visFrameCount -= inDone;
+				} while(samplesProcessed && visFrameCount);
 			}
 		} else if(r8bvis) {
 			for(;;) {