diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4dac685..341f462 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@
 All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ---
+# [0.5.3] - 2023-12-19
+
+###
+
+- Fixed issue causing valgrind memory error due to non-initialized struct in add_if_index() in zfw.c.
+
 # [0.5.2] - 2023-11-27
 
 ###
diff --git a/src/zfw.c b/src/zfw.c
index 91142fb..3688e0d 100644
--- a/src/zfw.c
+++ b/src/zfw.c
@@ -149,7 +149,7 @@ char *monitor_interface;
 char *tc_interface;
 char *object_file;
 char *direction_string;
-const char *argp_program_version = "0.5.2";
+const char *argp_program_version = "0.5.3";
 struct ring_buffer *ring_buffer;
 
 __u8 if_list[MAX_IF_LIST_ENTRIES];
@@ -1359,7 +1359,7 @@ int add_if_index(struct interface intf)
             open_if_map();
         }
         if_map.map_fd = if_fd;
-        struct ifindex_ip4 o_ifip4;
+        struct ifindex_ip4 o_ifip4 = {0};
         if_map.key = (uint64_t)&intf.index;
         if_map.flags = BPF_ANY;
         if_map.value = (uint64_t)&o_ifip4;