diff --git a/pngrtran.c b/pngrtran.c
index 9012f6fe9..1bb6b2406 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -665,9 +665,16 @@ png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
       return;
    if (red > 21474.83647 || red < -21474.83648 ||
        green > 21474.83647 || green < -21474.83648)
-      png_error(png_ptr, "ignoring out of range rgb_to_gray coefficients");
-   red_fixed = (int)((float)red*100000.0 + 0.5);
-   green_fixed = (int)((float)green*100000.0 + 0.5);
+   {
+      png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
+      red_fixed = -1;
+      green_fixed = -1;
+   }
+   else
+   {
+      red_fixed = (int)((float)red*100000.0 + 0.5);
+      green_fixed = (int)((float)green*100000.0 + 0.5);
+   }
    png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
 }
 #endif