diff --git a/renderdoc/core/image_viewer.cpp b/renderdoc/core/image_viewer.cpp
index 2d346c2da..6c902bf9f 100644
--- a/renderdoc/core/image_viewer.cpp
+++ b/renderdoc/core/image_viewer.cpp
@@ -726,7 +726,15 @@ void ImageViewer::RefreshFile()
     texDetails.width = exrImage.width;
     texDetails.height = exrImage.height;
 
-    datasize = texDetails.width * texDetails.height * 4 * sizeof(float);
+    if(texDetails.width > 16384 || texDetails.width > 16384)
+    {
+      SET_ERROR_RESULT(m_Error, ResultCode::OutOfMemory,
+                       "EXR dimension %d x %d is too large for display", exrImage.width,
+                       exrImage.height);
+      return;
+    }
+
+    datasize = size_t(texDetails.width) * size_t(texDetails.height) * 4 * sizeof(float);
     data = (byte *)malloc(datasize);
 
     if(!data)