diff --git a/Sources/CDunneAudioKit/DunneCore/Sampler/SampleOscillator.h b/Sources/CDunneAudioKit/DunneCore/Sampler/SampleOscillator.h
index e442b2e..42e2306 100644
--- a/Sources/CDunneAudioKit/DunneCore/Sampler/SampleOscillator.h
+++ b/Sources/CDunneAudioKit/DunneCore/Sampler/SampleOscillator.h
@@ -20,7 +20,7 @@ namespace DunneCore
         // return true if we run out of samples
         inline bool getSample(SampleBuffer *sampleBuffer, int sampleCount, float *output, float gain)
         {
-            if (sampleBuffer == NULL || indexPoint > sampleBuffer->endPoint) return true;
+            if (sampleBuffer == nullptr || indexPoint > sampleBuffer->endPoint) return true;
             *output = sampleBuffer->interp(indexPoint, gain);
             
             indexPoint += multiplier * increment;
@@ -35,7 +35,7 @@ namespace DunneCore
         // return true if we run out of samples
         inline bool getSamplePair(SampleBuffer *sampleBuffer, int sampleCount, float *leftOutput, float *rightOutput, float gain)
         {
-            if (sampleBuffer == NULL || indexPoint > sampleBuffer->endPoint) return true;
+            if (sampleBuffer == nullptr || indexPoint > sampleBuffer->endPoint) return true;
             sampleBuffer->interp(indexPoint, leftOutput, rightOutput, gain);
             
             indexPoint += multiplier * increment;