diff --git a/media-sound/musescore/files/musescore-4.6.3-fix_noqtdebug.patch b/media-sound/musescore/files/musescore-4.6.3-fix_noqtdebug.patch
new file mode 100644
index 0000000000000..72d500692f566
--- /dev/null
+++ b/media-sound/musescore/files/musescore-4.6.3-fix_noqtdebug.patch
@@ -0,0 +1,15 @@
+See https://bugs.gentoo.org/966628
+PR merged https://github.com/musescore/MuseScore/pull/30422.patch
+--- a/src/importexport/midi/internal/midiimport/importmidi_tuplet.cpp
++++ b/src/importexport/midi/internal/midiimport/importmidi_tuplet.cpp
+@@ -895,9 +895,9 @@ void addTupletEvents(std::multimap<ReducedFraction, TupletData>& tupletEvents,
+                 message += QString::number(tiedTuplet.voice) + ", chord voice = ";
+                 message += QString::number(midiChord.voice) + ", bar number (from 1) = ";
+                 message += QString::number(midiChord.barIndex + 1);
+-#endif
+                 Q_ASSERT_X(tiedTuplet.voice == midiChord.voice,
+                            "MidiTuplet::addTupletEvents", message.toLatin1().data());
++#endif
+ 
+                 for (int j: tiedTuplet.tiedNoteIndexes) {
+                     midiChord.notes[j].tuplet = it;
diff --git a/media-sound/musescore/musescore-4.6.3.ebuild b/media-sound/musescore/musescore-4.6.3.ebuild
index ecbe66e67fd4a..ef7d4de411b03 100644
--- a/media-sound/musescore/musescore-4.6.3.ebuild
+++ b/media-sound/musescore/musescore-4.6.3.ebuild
@@ -70,6 +70,7 @@ PATCHES=(
 	"${FILESDIR}/${PN}-4.6.3-rm_tinyxml.patch"
 	"${FILESDIR}/${PN}-4.6.3-missing_includes.patch"
 	"${FILESDIR}/${PN}-4.6.3-fix_qt610.patch"
+	"${FILESDIR}/${PN}-4.6.3-fix_noqtdebug.patch"
 	# unbundle 3rd libs
 	"${FILESDIR}/${PN}-4.6.3-unbundle-lame.patch"
 	"${FILESDIR}/${PN}-4.6.3-unbundle-pugixml.patch"