diff --git a/lib/RELEASE-NOTES b/lib/RELEASE-NOTES
index 39d5e8fa15..dda358c54e 100644
--- a/lib/RELEASE-NOTES
+++ b/lib/RELEASE-NOTES
@@ -81,6 +81,9 @@
   sgmltools has been removed, this new support is always enabled.
   Having sgmltools installed or not will not change anything in LyX.
 
+* Postscript -> PDF convertor (ps2pdf) uses -dALLOWPSTRANSPARENCY by
+  default now (implemented since ghostscript 9.53.3, see bug #12303).
+
 !!!The following pref variables were added in 2.4:
 
 * \ct_additions_underlined true|false: determines whether additions in change tracking
diff --git a/lib/configure.py b/lib/configure.py
index 3a3192bb59..7a5052f294 100644
--- a/lib/configure.py
+++ b/lib/configure.py
@@ -1064,7 +1064,7 @@ def checkConverterEntries():
     checkProg('a RTF -> HTML converter', ['unrtf --html  $$i > $$o'],
         rc_entry = [ r'\converter rtf      html        "%%"	""' ])
     # Do not define a converter to pdf6, ps is a pure export format
-    checkProg('a PS to PDF converter', ['ps2pdf $$i $$o'],
+    checkProg('a PS to PDF converter', ['ps2pdf -dALLOWPSTRANSPARENCY $$i $$o'],
         rc_entry = [ r'\converter ps         pdf        "%%"	"hyperref-driver=dvips"' ])
     #
     checkProg('a PS to TXT converter', ['pstotext $$i > $$o'],