diff --git a/lib/modules/Protocols.pmod/IMAP.pmod/parse_line.pike b/lib/modules/Protocols.pmod/IMAP.pmod/parse_line.pike
index 5eee37361a11939fbce752ca28044313c02e6cf4..ae9d78a09411659668f49f62a651e53f062e29d3 100644
--- a/lib/modules/Protocols.pmod/IMAP.pmod/parse_line.pike
+++ b/lib/modules/Protocols.pmod/IMAP.pmod/parse_line.pike
@@ -168,7 +168,7 @@ mapping get_token(int eol, int accept_options)
     string s = get_string();
     return s && ([ "type" : "string", "string" : s ]);
   }
-  case "{": {
+  case '{': {
     object s = get_string();
     return s && ([ "type" : "literal", "length" : s->length ]);
   }