diff --git a/src/message.c b/src/message.c
index bff54d0..aa3506e 100644
--- a/src/message.c
+++ b/src/message.c
@@ -2285,7 +2285,7 @@
     redraw_win_later(wp, UPD_NOT_VALID);
 
     // set msg_col so that a newline is written if needed
-    msg_col = STRLEN(t_s);
+    msg_col = (int)STRLEN(t_s);
 }
 #endif