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-rw-r--r--lib/database.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/database.cc b/lib/database.cc
index 88c85ed4..c91e97c1 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -147,6 +147,7 @@ prefix_t BOOLEAN_PREFIX_INTERNAL[] = {
prefix_t BOOLEAN_PREFIX_EXTERNAL[] = {
{ "thread", "G" },
{ "tag", "K" },
+ { "is", "K" },
{ "id", "Q" }
};