diff --git a/isync/trunk/PKGBUILD b/isync/trunk/PKGBUILD
index 061b3ead10e0..ef363ec30551 100644
--- a/isync/trunk/PKGBUILD
+++ b/isync/trunk/PKGBUILD
@@ -6,19 +6,26 @@
 
 pkgname=isync
 pkgver=1.4.4
-pkgrel=2
+pkgrel=2.1
 pkgdesc="IMAP and MailDir mailbox synchronizer"
 arch=('x86_64')
 url="https://isync.sourceforge.io/"
 license=('GPL2')
 depends=('libsasl' 'zlib')
 source=(https://downloads.sourceforge.net/sourceforge/isync/$pkgname-$pkgver.tar.gz
-        https://downloads.sourceforge.net/sourceforge/isync/$pkgname-$pkgver.tar.gz.asc)
+        https://downloads.sourceforge.net/sourceforge/isync/$pkgname-$pkgver.tar.gz.asc
+        openssl3-openssl11-compatibility.patch)
 md5sums=('29acced5c6f0c87e631b0ff641f8f942'
-         'SKIP')
+         'SKIP'
+         '34da2a042a35c6fc8bc44f38467d36d3')
 validpgpkeys=('96DD32BFBF9FAB04B0D95305AA283E0B2F1BB1D1'
               '63BFD037CAD71E8DFF3AEA3AC17714F08D1BDBBA')
 
+prepare() {
+  cd $pkgname-$pkgver
+  patch --forward --strip=1 --input="${srcdir}/openssl3-openssl11-compatibility.patch"
+}
+
 build() {
   cd $pkgname-$pkgver
 
diff --git a/isync/trunk/openssl3-openssl11-compatibility.patch b/isync/trunk/openssl3-openssl11-compatibility.patch
new file mode 100644
index 000000000000..c539e46e151c
--- /dev/null
+++ b/isync/trunk/openssl3-openssl11-compatibility.patch
@@ -0,0 +1,13 @@
+--- ./src/socket.c.orig	2022-11-07 19:54:41.106669469 +0900
++++ ./src/socket.c	2022-11-07 19:54:32.709760697 +0900
+@@ -263,6 +263,10 @@
+ 	if (!(conf->ssl_versions & TLSv1_3))
+ 		options |= SSL_OP_NO_TLSv1_3;
+ #endif
++#ifdef SSL_OP_IGNORE_UNEXPECTED_EOF
++	/* Only for OpenSSL 3+ to keep OpenSSL 1.1.1 behavior */
++	options |= SSL_OP_IGNORE_UNEXPECTED_EOF;
++#endif
+ 
+ 	SSL_CTX_set_options( mconf->SSLContext, options );
+