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diff --git a/third_party/libtiff/tif_dir.c b/third_party/libtiff/tif_dir.c
index 73212c02d..16ce3d3ce 100644
--- a/third_party/libtiff/tif_dir.c
+++ b/third_party/libtiff/tif_dir.c
@@ -426,6 +426,14 @@ _TIFFVSetField(TIFF* tif, uint32 tag, va_list ap)
case TIFFTAG_REFERENCEBLACKWHITE:
/* XXX should check for null range */
_TIFFsetFloatArray(&td->td_refblackwhite, va_arg(ap, float*), 6);
+ for (int i = 0; i < 6; i++) {
+ if (isnan(td->td_refblackwhite[i])) {
+ if (i % 2 == 0)
+ td->td_refblackwhite[i] = 0;
+ else
+ td->td_refblackwhite[i] = pow(2, td->td_bitspersample) - 1;
+ }
+ }
break;
case TIFFTAG_INKNAMES:
v = (uint16) va_arg(ap, uint16_vap);
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