diff --git a/src/sfizz/Region.h b/src/sfizz/Region.h
index 9b6e01b2..b18b7bd5 100644
--- a/src/sfizz/Region.h
+++ b/src/sfizz/Region.h
@@ -47,7 +47,7 @@ struct Region {
     ~Region() = default;
 
     /**
-     * @brief Get the number which identifies this region, also its index
+     * @brief Get the number which identifies this region
      */
     int getIdNumber() const noexcept
     {
@@ -246,7 +246,7 @@ struct Region {
      */
     float getGainToEffectBus(unsigned number) const noexcept;
 
-    const int regionNumber {};
+    const int regionNumber { -1 };
 
     // Sound source: sample playback
     FileId sampleId {}; // Sample
diff --git a/src/sfizz/Voice.h b/src/sfizz/Voice.h
index a9b347d2..59058c59 100644
--- a/src/sfizz/Voice.h
+++ b/src/sfizz/Voice.h
@@ -42,7 +42,7 @@ public:
         CC
     };
     /**
-     * @brief Get the number which identifies this voice, its index
+     * @brief Get the number which identifies this voice
      */
     int getIdNumber() const noexcept
     {
@@ -299,7 +299,7 @@ private:
      */
     void switchState(State s);
 
-    const int voiceNumber {};
+    const int voiceNumber { -1 };
     StateListener* stateListener = nullptr;
 
     Region* region { nullptr };