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-rw-r--r--crawl-ref/source/message.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/crawl-ref/source/message.h b/crawl-ref/source/message.h
index 5be11ce82f..d2cafbeeab 100644
--- a/crawl-ref/source/message.h
+++ b/crawl-ref/source/message.h
@@ -62,7 +62,7 @@ class formatted_string;
void formatted_mpr(const formatted_string& fs, int channel = MSGCH_PLAIN,
int param = 0);
-void formatted_message_history(const std::string st,
+void formatted_message_history(const std::string &st,
int channel = MSGCH_PLAIN, int param = 0);
// 4.1-style mpr, currently named mprf for minimal disruption.