diff --git a/contrib/gregbook/rpng-win.c b/contrib/gregbook/rpng-win.c
index 4254c17ef..1a6f87615 100644
--- a/contrib/gregbook/rpng-win.c
+++ b/contrib/gregbook/rpng-win.c
@@ -499,7 +499,7 @@ static int rpng_win_create_window(HINSTANCE hInst, int showmode)
 
     /* Guard against integer overflow */
     if (image_height > ((size_t)(-1))/wimage_rowbytes) {
-        fprintf(stderr, PROGNAME ":  image_data buffer would be too large\n",
+        fprintf(stderr, PROGNAME ":  image_data buffer would be too large\n");
         return 4;   /* fail */
     }