diff --git a/scripts/base/utils/files.bro b/scripts/base/utils/files.bro
index ccd03df0e6..e1e599b0b6 100644
--- a/scripts/base/utils/files.bro
+++ b/scripts/base/utils/files.bro
@@ -19,7 +19,7 @@ function generate_extraction_filename(prefix: string, c: connection, suffix: str
 ## the filename.
 function extract_filename_from_content_disposition(data: string): string
 	{
-	local filename = sub(data, /^.*[fF][iI][lL][eE][nN][aA][mM][eE]=/, "");
+	local filename = sub(data, /^.*[fF][iI][lL][eE][nN][aA][mM][eE][[:blank:]]*=[[:blank:]]*/, "");
 	# Remove quotes around the filename if they are there.
 	if ( /^\"/ in filename )
 		filename =  split_n(filename, /\"/, F, 2)[2];