diff --git a/debian/patches/0019-trek-Fix-error-that-prevents-visual-command-from-wor.patch b/debian/patches/0019-trek-Fix-error-that-prevents-visual-command-from-wor.patch
new file mode 100644
index 0000000..b24f4b4
--- /dev/null
+++ b/debian/patches/0019-trek-Fix-error-that-prevents-visual-command-from-wor.patch
@@ -0,0 +1,24 @@
+From: "Dr. Tobias Quathamer" <toddy@debian.org>
+Date: Fri, 28 Jul 2023 14:36:42 +0200
+Subject: trek: Fix error that prevents visual command from working under some
+ circumstances.
+
+Thanks: James Baldwin-Brown <jgbaldwinbrown@gmail.com>
+Closes: #964235
+---
+ trek/trek.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/trek/trek.h b/trek/trek.h
+index 62ac1df..7dbb5f5 100644
+--- a/trek/trek.h
++++ b/trek/trek.h
+@@ -201,7 +201,7 @@ struct kling
+ 
+ struct xy
+ {
+-	unsigned char	x, y;		/* coordinates */
++	signed char	x, y;		/* coordinates */
+ };
+ 
+ 
diff --git a/debian/patches/series b/debian/patches/series
index c257c17..c4afdb9 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -16,3 +16,4 @@
 0016-Better-explanation-how-to-read-the-documentation.patch
 0017-hack-Fix-segv-when-i-inventory-done-after-load-from-.patch
 0018-Add-missing-format-strings.patch
+0019-trek-Fix-error-that-prevents-visual-command-from-wor.patch