diff --git a/wadsrc/static/engine/compatibility/c6f9e49e397c0b424e8030abc23ac003.mhk b/wadsrc/static/engine/compatibility/c6f9e49e397c0b424e8030abc23ac003.mhk
new file mode 100644
index 000000000..6b7284136
--- /dev/null
+++ b/wadsrc/static/engine/compatibility/c6f9e49e397c0b424e8030abc23ac003.mhk
@@ -0,0 +1,3 @@
+// flip inverted keyholes in TD's $shore.map
+sprite 298 clearflags 8
+sprite 307 clearflags 8