diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 8a093612..58c360ab 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -1010,7 +1010,7 @@ void sfz::Synth::checkNotePolyphony(const Region* region, int delay, const Trigg
                 }
                 break;
             case SfzSelfMask::dontMask:
-                if (!selfMaskCandidate || selfMaskCandidate->getSourcePosition() < voice->getSourcePosition())
+                if (!selfMaskCandidate || selfMaskCandidate->getAge() < voice->getAge())
                     selfMaskCandidate = voice;
                 break;
             }
diff --git a/src/sfizz/Voice.cpp b/src/sfizz/Voice.cpp
index 4a0fc5b0..27323c6d 100644
--- a/src/sfizz/Voice.cpp
+++ b/src/sfizz/Voice.cpp
@@ -97,6 +97,7 @@ void sfz::Voice::startVoice(Region* region, int delay, const TriggerEvent& event
             return;
         }
         speedRatio = static_cast<float>(currentPromise->sampleRate / this->sampleRate);
+        sourcePosition = region->getOffset(currentPromise->oversamplingFactor);
     }
 
     // do Scala retuning and reconvert the frequency into a 12TET key number
@@ -123,7 +124,6 @@ void sfz::Voice::startVoice(Region* region, int delay, const TriggerEvent& event
         equalizers[i].setup(*region, i, triggerEvent.value);
     }
 
-    sourcePosition = region->getOffset();
     triggerDelay = delay;
     initialDelay = delay + static_cast<int>(region->getDelay() * sampleRate);
     baseFrequency = resources.tuning.getFrequencyOfKey(triggerEvent.number);
@@ -856,11 +856,6 @@ bool sfz::Voice::releasedOrFree() const noexcept
     return state != State::playing || egAmplitude.isReleased();
 }
 
-uint32_t sfz::Voice::getSourcePosition() const noexcept
-{
-    return sourcePosition;
-}
-
 void sfz::Voice::setMaxFiltersPerVoice(size_t numFilters)
 {
     if (numFilters == filters.size())
diff --git a/src/sfizz/Voice.h b/src/sfizz/Voice.h
index 9d5bfceb..70e5fb74 100644
--- a/src/sfizz/Voice.h
+++ b/src/sfizz/Voice.h
@@ -248,12 +248,6 @@ public:
      * @return float
      */
     float getAveragePower() const noexcept;
-    /**
-     * @brief Get the position of the voice in the source, in samples
-     *
-     * @return uint32_t
-     */
-    uint32_t getSourcePosition() const noexcept;
     /**
      * Returns the region that is currently playing. May be null if the voice is not active!
      *