diff --git a/0002-avoid-ssize_t.patch b/0002-avoid-ssize_t.patch
new file mode 100644
index 0000000000000000000000000000000000000000..c20c1a7ac8927260746aa8f76fbc199528d6debc
--- /dev/null
+++ b/0002-avoid-ssize_t.patch
@@ -0,0 +1,32 @@
+diff --git a/master/globals.h b/master/globals.h
+index 840a160..23eaaaf 100644
+--- a/master/globals.h
++++ b/master/globals.h
+@@ -263,7 +263,7 @@ unsigned int ec_master_count(void);
+ void ec_print_data(const uint8_t *, size_t);
+ void ec_print_data_diff(const uint8_t *, const uint8_t *, size_t);
+ size_t ec_state_string(uint8_t, char *, uint8_t);
+-ssize_t ec_mac_print(const uint8_t *, char *);
++size_t ec_mac_print(const uint8_t *, char *);
+ int ec_mac_is_zero(const uint8_t *);
+ 
+ ec_master_t *ecrt_request_master_err(unsigned int);
+diff --git a/master/module.c b/master/module.c
+index 573a694..250f612 100644
+--- a/master/module.c
++++ b/master/module.c
+@@ -239,12 +239,12 @@ int ec_mac_equal(
+  *
+  * \return number of bytes written.
+  */
+-ssize_t ec_mac_print(
++size_t ec_mac_print(
+         const uint8_t *mac, /**< MAC address */
+         char *buffer /**< Target buffer. */
+         )
+ {
+-    off_t off = 0;
++    size_t off = 0;
+     unsigned int i;
+ 
+     for (i = 0; i < ETH_ALEN; i++) {
diff --git a/ethercat-igh.spec b/ethercat-igh.spec
index 35bacc7917907ee6d801c278b1987e577cc65ca7..8c432acc7f4eb90113674b507c1c43a6d8b21568 100644
--- a/ethercat-igh.spec
+++ b/ethercat-igh.spec
@@ -13,6 +13,7 @@ BuildRequires: make
 BuildRequires: patchelf
 BuildRequires: kernel-headers, kernel-devel
 Patch0: 0001-ethercat-Fix-ethercat-tool-compilation.patch
+Patch1: 0002-avoid-ssize_t.patch
 
 %description
 This is an open-source EtherCAT master implementation for Linux.
@@ -21,6 +22,7 @@ This is an open-source EtherCAT master implementation for Linux.
 %setup -q -n ethercat-e1000e-%{version}
 
 %patch0 -p1
+%patch1 -p1
 
 CPPFLAGS="${CPPFLAGS} -Doff64_t=__off64_t";export CPPFLAGS;
 ./bootstrap
@@ -108,3 +110,7 @@ depmod -a
 * Fri Feb 24 2023 xxhong <xxhong@buaa.edu.cn> - 5.10-5
 - add 0001-ethercat-Fix-ethercat-tool-compilation.patch
 - remove 8139too,e100,e1000,ccat,igb
+%changelog
+* Fri July 28 2023 zhixing <zhixing@iscas.ac.cn> - 5.10-5
+- ethercat: modified ssize_t into size_t
+- add 0002-avoid-ssize_t.patch for synchronize the modification of the master branch