diff --git a/include/AdePT/core/AdePTTransport.cuh b/include/AdePT/core/AdePTTransport.cuh
index 3acc6d64..65f7dc11 100644
--- a/include/AdePT/core/AdePTTransport.cuh
+++ b/include/AdePT/core/AdePTTransport.cuh
@@ -136,6 +136,7 @@ __global__ void InitTracks(adeptint::TrackData *trackinfo, int ntracks, int star
     track.numIALeft[0] = -1.0;
     track.numIALeft[1] = -1.0;
     track.numIALeft[2] = -1.0;
+    track.numIALeft[3] = -1.0;
 
     track.initialRange       = -1.0;
     track.dynamicRangeFactor = -1.0;
diff --git a/include/AdePT/core/Track.cuh b/include/AdePT/core/Track.cuh
index 22d2c0f7..a1e56155 100644
--- a/include/AdePT/core/Track.cuh
+++ b/include/AdePT/core/Track.cuh
@@ -69,6 +69,7 @@ struct Track {
     this->numIALeft[0] = -1.0;
     this->numIALeft[1] = -1.0;
     this->numIALeft[2] = -1.0;
+    this->numIALeft[3] = -1.0;
 
     this->initialRange       = -1.0;
     this->dynamicRangeFactor = -1.0;