diff --git a/src/bin/pg_controldata/pg_controldata.c b/src/bin/pg_controldata/pg_controldata.c
index e92feab..82a58d5 100644
--- a/src/bin/pg_controldata/pg_controldata.c
+++ b/src/bin/pg_controldata/pg_controldata.c
@@ -157,9 +157,12 @@ main(int argc, char *argv[])
 	/* get a copy of the control file */
 	ControlFile = get_controlfile(DataDir, progname);
 	if (!ControlFile)
+	{
 		printf(_("WARNING: Calculated CRC checksum does not match value stored in file.\n"
 				 "Either the file is corrupt, or it has a different layout than this program\n"
-				 "is expecting.  The results below are untrustworthy.\n\n"));
+				 "is expecting.\n"));
+		exit(1);
+	}
 
 	/*
 	 * This slightly-chintzy coding will work as long as the control file