diff --git a/renderdoc/core/image_viewer.cpp b/renderdoc/core/image_viewer.cpp
index 7d6015bd3..00a9ba2a9 100644
--- a/renderdoc/core/image_viewer.cpp
+++ b/renderdoc/core/image_viewer.cpp
@@ -309,7 +309,7 @@ void ImageViewer::RefreshFile()
 
 	if(!f)
 	{
-		RDCERR("Couldn't open file! Exclusive lock elsewhere?");
+		RDCERR("Couldn't open %s! Exclusive lock elsewhere?", filename);
 		return;
 	}