diff --git a/cockatrice/src/filters/deck_filter_string.cpp b/cockatrice/src/filters/deck_filter_string.cpp
index 42a77fe5a..6b671831d 100644
--- a/cockatrice/src/filters/deck_filter_string.cpp
+++ b/cockatrice/src/filters/deck_filter_string.cpp
@@ -31,7 +31,7 @@ GenericQuery <- String
 
 NonDoubleQuoteUnlessEscaped <- '\\\"'. / !["].
 NonSingleQuoteUnlessEscaped <- "\\\'". / !['].
-UnescapedStringListPart <- !['":<>=! ].
+UnescapedStringListPart <- !['":<>()=! ].
 SingleApostropheString <- (UnescapedStringListPart+ ws*)* ['] (UnescapedStringListPart+ ws*)*
 
 String <- SingleApostropheString / UnescapedStringListPart+ / ["] <NonDoubleQuoteUnlessEscaped*> ["] / ['] <NonSingleQuoteUnlessEscaped*> [']