diff --git a/src/pbrt/film.cpp b/src/pbrt/film.cpp
index a5700a1c2..e7e02bb0b 100644
--- a/src/pbrt/film.cpp
+++ b/src/pbrt/film.cpp
@@ -882,7 +882,7 @@ SpectralFilm::SpectralFilm(FilmBaseParameters p, Float lambdaMin, Float lambdaMa
         pixel.weightSums = bucketWeightBuffer;
         bucketWeightBuffer += nBuckets;
         pixel.bucketSplats = splatBuffer;
-        splatBuffer += NSpectrumSamples;
+        splatBuffer += nBuckets;
     }
 }