diff --git a/src/add-ons/media/plugins/avi_reader/libOpenDML/OpenDMLParser.cpp b/src/add-ons/media/plugins/avi_reader/libOpenDML/OpenDMLParser.cpp
index 30f343214b..35bb23b8db 100644
--- a/src/add-ons/media/plugins/avi_reader/libOpenDML/OpenDMLParser.cpp
+++ b/src/add-ons/media/plugins/avi_reader/libOpenDML/OpenDMLParser.cpp
@@ -361,7 +361,7 @@ OpenDMLParser::Parse()
 
 		if (size == 0 && fourcc == FOURCC('R','I','F','F')) {
 			//Calculate size from filesize
-			size = fSize - 8;
+			size = maxsize;
 			ERROR("OpenDMLParser::Parse: Warning chunk '"FOURCC_FORMAT"', size is 0 calculating as %lu\n", FOURCC_PARAM(fourcc), size);
 		}