diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 3f93beb..ef8c0e9 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -311,6 +311,9 @@
 au BufNewFile,BufRead *.c			call dist#ft#FTlpc()
 au BufNewFile,BufRead *.lpc,*.ulpc		setf lpc
 
+" C3
+au BufNewFile,BufRead *.c3,*.c3i,*.c3t		setf c3
+
 " Cairo
 au BufNewFile,BufRead *.cairo			setf cairo
 
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 17d6a44..001a970 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -144,6 +144,7 @@
     bzl: ['file.bazel', 'file.bzl', 'WORKSPACE', 'WORKSPACE.bzlmod'],
     bzr: ['bzr_log.any', 'bzr_log.file'],
     c: ['enlightenment/file.cfg', 'file.qc', 'file.c', 'some-enlightenment/file.cfg', 'file.mdh', 'file.epro'],
+    c3: ['file.c3', 'file.c3i', 'file.c3t'],
     cabal: ['file.cabal'],
     cabalconfig: ['cabal.config', expand("$HOME/.config/cabal/config")] + WhenConfigHome('$XDG_CONFIG_HOME/cabal/config'),
     cabalproject: ['cabal.project', 'cabal.project.local'],
diff --git a/src/version.c b/src/version.c
index 0ffb001..fe1246a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    880,
+/**/
     879,
 /**/
     878,