diff --git a/util/cpp/domacro.c b/util/cpp/domacro.c
index 3aaf9ff2a..d01140164 100644
--- a/util/cpp/domacro.c
+++ b/util/cpp/domacro.c
@@ -448,7 +448,7 @@ do_line(l)
 
 	PushBack();
 	skipline();
-	LineNumber = l - 1;	/* the number of the next input line */
+	LineNumber = l;		/* the number of the next input line */
 	if (t == STRING)	/* is there a filespecifier? */
 		FileName = tk.tk_str;
 }