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-rw-r--r--src/mono_opt.sml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mono_opt.sml b/src/mono_opt.sml
index af9e9a9c..17d23cc2 100644
--- a/src/mono_opt.sml
+++ b/src/mono_opt.sml
@@ -129,6 +129,7 @@ val checkCssUrl = CharVector.all (fn ch => Char.isAlphaNum ch
orelse ch = #"/"
orelse ch = #"."
orelse ch = #"_"
+ orelse ch = #"+"
orelse ch = #"-"
orelse ch = #"%"
orelse ch = #"?"