--- ray/src/rt/rc2.c	2019/08/14 20:07:20	2.23
+++ ray/src/rt/rc2.c	2023/04/07 00:03:26	2.25
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: rc2.c,v 2.23 2019/08/14 20:07:20 greg Exp $";
+static const char RCSid[] = "$Id: rc2.c,v 2.25 2023/04/07 00:03:26 greg Exp $";
 #endif
 /*
  * Accumulate ray contributions for a set of materials
@@ -143,11 +143,15 @@ getostream(const char *ospec, const char *mname, int b
 	LUENT			*lep;
 	STREAMOUT		*sop;
 	char			*cp;
-	
+
+	info[0] = '\0';
 	if (ospec == NULL) {			/* use stdout? */
 		if (!noopen & !using_stdout) {
 			if (outfmt != 'a')
 				SET_FILE_BINARY(stdout);
+#ifdef getc_unlocked
+			flockfile(stdout);	/* avoid lock/unlock overhead */
+#endif
 			if (header) {
 				cp = info;
 				if (yres > 0) {
@@ -164,9 +168,6 @@ getostream(const char *ospec, const char *mname, int b
 			if (waitflush > 0)
 				fflush(stdout);
 			stdos.xr = xres; stdos.yr = yres;
-#ifdef getc_unlocked
-			flockfile(stdout);	/* avoid lock/unlock overhead */
-#endif
 			using_stdout = 1;
 		}
 		stdos.ofp = stdout;