diff --git a/image_analysis/bragg_prediction/BraggPrediction.cpp b/image_analysis/bragg_prediction/BraggPrediction.cpp
index 9a337c16..fe6c2b6d 100644
--- a/image_analysis/bragg_prediction/BraggPrediction.cpp
+++ b/image_analysis/bragg_prediction/BraggPrediction.cpp
@@ -103,7 +103,7 @@ int BraggPrediction::Calc(const DiffractionExperiment &experiment, const Crystal
                         .dist_ewald = dist_ewald_sphere,
                         .rlp = 1.0,
                         .partiality = 1.0,
-                        .zeta = NAN
+                        .zeta = 1.0
                     };
                     ++i;
                 }
diff --git a/image_analysis/bragg_prediction/BraggPredictionGPU.cu b/image_analysis/bragg_prediction/BraggPredictionGPU.cu
index b79ccef4..ea8080d2 100644
--- a/image_analysis/bragg_prediction/BraggPredictionGPU.cu
+++ b/image_analysis/bragg_prediction/BraggPredictionGPU.cu
@@ -84,7 +84,7 @@ namespace {
         out.dist_ewald = dist_ewald;
         out.rlp = 1.0f;
         out.partiality = 1.0f;
-        out.zeta = NAN;
+        out.zeta = 1.0f;
         return true;
     }