diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index c2c7779c..caf410b1 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -627,11 +627,6 @@ sfz::Voice* sfz::Synth::findFreeVoice() noexcept
 
 int sfz::Synth::getNumActiveVoices() const noexcept
 {
-    auto activeVoices = 0;
-    for (const auto& voice : voices) {
-        if (!voice->isFree())
-            activeVoices++;
-    }
     return activeVoices;
 }
 
@@ -711,7 +706,7 @@ void sfz::Synth::renderBlock(AudioSpan<float> buffer) noexcept
         return;
     }
 
-    int numActiveVoices { 0 };
+    activeVoices = 0;
     { // Main render block
         ScopedTiming logger { callbackBreakdown.renderMethod, ScopedTiming::Operation::addToDuration };
         tempSpan->fill(0.0f);
@@ -730,7 +725,7 @@ void sfz::Synth::renderBlock(AudioSpan<float> buffer) noexcept
             if (voice->isFree())
                 continue;
 
-            numActiveVoices++;
+            activeVoices++;
             renderVoiceToOutputs(*voice, *tempSpan);
             callbackBreakdown.data += voice->getLastDataDuration();
             callbackBreakdown.amplitude += voice->getLastAmplitudeDuration();
@@ -770,7 +765,7 @@ void sfz::Synth::renderBlock(AudioSpan<float> buffer) noexcept
     }
 
     callbackBreakdown.dispatch = dispatchDuration;
-    resources.logger.logCallbackTime(callbackBreakdown, numActiveVoices, numFrames);
+    resources.logger.logCallbackTime(callbackBreakdown, activeVoices, numFrames);
 
     // Reset the dispatch counter
     dispatchDuration = Duration(0);
diff --git a/src/sfizz/Synth.h b/src/sfizz/Synth.h
index bcd79542..a0f6f09a 100644
--- a/src/sfizz/Synth.h
+++ b/src/sfizz/Synth.h
@@ -731,6 +731,7 @@ private:
     float sampleRate { config::defaultSampleRate };
     float volume { Default::globalVolume };
     int numVoices { config::numVoices };
+    int activeVoices { 0 };
     Oversampling oversamplingFactor { config::defaultOversamplingFactor };
 
     // Distribution used to generate random value for the *rand opcodes