diff --git a/common/AzimuthalIntegrationProfile.cpp b/common/AzimuthalIntegrationProfile.cpp
index 3a9d5cad..a74728d8 100644
--- a/common/AzimuthalIntegrationProfile.cpp
+++ b/common/AzimuthalIntegrationProfile.cpp
@@ -6,7 +6,7 @@
 
 inline float sum_to_count(float sum, uint64_t count) {
     if (count == 0)
-        return 0.0f;
+        return NAN;
     else
         return sum / (static_cast<float>(count));
 }