diff --git a/free.c b/free.c
index 5fb3d7d3..581f5e16 100644
--- a/free.c
+++ b/free.c
@@ -188,7 +188,7 @@ static void check_unit_set(int *unit_set)
 {
     if (*unit_set)
 	xerrx(EXIT_FAILURE,
-		_("Multiple unit options doesn't make sense."));
+		_("Multiple unit options don't make sense."));
     *unit_set = 1;
 }