diff --git a/src/pbrt/cameras.cpp b/src/pbrt/cameras.cpp
index 3aa192ebe8d297eff5edad3cd6f0342b591d84c8..f276869dd402e72fddbd6e7752739664ad7831e5 100644
--- a/src/pbrt/cameras.cpp
+++ b/src/pbrt/cameras.cpp
@@ -1373,7 +1373,7 @@ RealisticCamera *RealisticCamera::Create(const ParameterDictionary &parameters,
     };
 
     std::string apertureName = ResolveFilename(parameters.GetOneString("aperture", ""));
-    Image apertureImage;
+    Image apertureImage(alloc);
     if (!apertureName.empty()) {
         // built-in diaphragm shapes
         if (apertureName == "gaussian") {