diff --git a/gnu/local.mk b/gnu/local.mk
index 2ea9806b7e..5cc134d3d3 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1795,6 +1795,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/pam-krb5-CVE-2020-10595.patch		\
   %D%/packages/patches/pango-skip-libthai-test.patch		\
   %D%/packages/patches/password-store-tree-compat.patch		\
+  %D%/packages/patches/pdfpc-build-with-vala-0.56.patch         \
   %D%/packages/patches/petri-foo-0.1.87-fix-recent-file-not-exist.patch			\
   %D%/packages/patches/plasma-framework-fix-KF5PlasmaMacros.cmake.patch \
   %D%/packages/patches/plasp-fix-normalization.patch \
diff --git a/gnu/packages/patches/pdfpc-build-with-vala-0.56.patch b/gnu/packages/patches/pdfpc-build-with-vala-0.56.patch
new file mode 100644
index 0000000000..e9a4060248
--- /dev/null
+++ b/gnu/packages/patches/pdfpc-build-with-vala-0.56.patch
@@ -0,0 +1,40 @@
+From 18beaecbbcc066e0d4c889b3aa3ecaa7351f7768 Mon Sep 17 00:00:00 2001
+Message-ID: <18beaecbbcc066e0d4c889b3aa3ecaa7351f7768.1711183363.git.vivien@planete-kraus.eu>
+From: Evgeny Stambulchik <fnevgeny@gmail.com>
+Date: Tue, 25 Apr 2023 16:11:25 +0300
+Subject: [PATCH] Create Lists of nullable types
+
+---
+This is the pull request for issue 686, merged in master, not released
+yet.
+
+ src/classes/drawings/drawing_commands.vala | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/src/classes/drawings/drawing_commands.vala b/src/classes/drawings/drawing_commands.vala
+index 77e56e6..c305a8c 100644
+--- a/src/classes/drawings/drawing_commands.vala
++++ b/src/classes/drawings/drawing_commands.vala
+@@ -54,8 +54,8 @@ namespace pdfpc {
+         }
+ 
+         public void clear() {
+-            this.drawing_commands = new List<DrawingCommand>();
+-            this.redo_commands = new List<DrawingCommand>();
++            this.drawing_commands = new List<DrawingCommand?>();
++            this.redo_commands = new List<DrawingCommand?>();
+         }
+ 
+         public void add_line(bool is_eraser,
+@@ -70,7 +70,7 @@ namespace pdfpc {
+ 
+             // After adding a new line you can no longer redo the old
+             // path.
+-            this.redo_commands = new List<DrawingCommand>(); // clear
++            this.redo_commands = new List<DrawingCommand?>(); // clear
+ 
+             bool new_path = true;
+             double epsilon = 1e-4; // Less than 0.1 pixel for a 1000x1000 img
+-- 
+2.41.0
+
diff --git a/gnu/packages/pdf.scm b/gnu/packages/pdf.scm
index 36ebf8547d..44187c192c 100644
--- a/gnu/packages/pdf.scm
+++ b/gnu/packages/pdf.scm
@@ -1526,22 +1526,24 @@ (define-public pdfpc
              (commit (string-append "v" version))))
        (file-name (git-file-name name version))
        (sha256
-        (base32 "0kj84sf5hgr2v2ra6dxmxqcr173h17cpnhg9lcq36shdbdnncwg4"))))
+        (base32 "0kj84sf5hgr2v2ra6dxmxqcr173h17cpnhg9lcq36shdbdnncwg4"))
+       (patches
+        (search-patches "pdfpc-build-with-vala-0.56.patch"))))
     (build-system cmake-build-system)
     (arguments '(#:tests? #f))           ; no test target
-    (inputs
-     `(("cairo" ,cairo)
-       ("discount" ,discount) ; libmarkdown
-       ("qrencode" ,qrencode)
-       ("gtk+" ,gtk+)
-       ("gstreamer" ,gstreamer)
-       ("gst-plugins-base" ,gst-plugins-base)
-       ("json-glib" ,json-glib)
-       ("libgee" ,libgee)
-       ("poppler" ,poppler)
-       ("pango" ,pango)
-       ("vala" ,vala)
-       ("webkitgtk" ,webkitgtk-with-libsoup2)))
+    (inputs (list
+             cairo
+             discount ; libmarkdown
+             qrencode
+             gtk+
+             gstreamer
+             gst-plugins-base
+             json-glib
+             libgee
+             poppler
+             pango
+             vala
+             webkitgtk-with-libsoup2))
     (native-inputs
      (list pkg-config))
     (home-page "https://pdfpc.github.io/")