diff --git a/usr.bin/diff3/diff3.c b/usr.bin/diff3/diff3.c
index 514e78c79ed6..f3058e0d5c4e 100644
--- a/usr.bin/diff3/diff3.c
+++ b/usr.bin/diff3/diff3.c
@@ -570,7 +570,7 @@ printrange(FILE *p, struct range *r)
 		return;
 
 	if (r->from > r->to)
-			errx(EXIT_FAILURE, "invalid print range");
+		errx(EXIT_FAILURE, "invalid print range");
 
 	/*
 	 * XXX-THJ: We read through all of the file for each range printed.