diff --git a/src/local.c b/src/local.c
index b1ab040bb..47d634ce5 100644
--- a/src/local.c
+++ b/src/local.c
@@ -168,7 +168,7 @@ create_and_bind(const char *addr, const char *port)
 {
     struct addrinfo hints;
     struct addrinfo *result, *rp;
-    int s, listen_sock;
+    int s, listen_sock = -1;
 
     memset(&hints, 0, sizeof(struct addrinfo));
     hints.ai_family   = AF_UNSPEC;   /* Return IPv4 and IPv6 choices */
diff --git a/src/redir.c b/src/redir.c
index 4a5a489f0..e60bd4870 100644
--- a/src/redir.c
+++ b/src/redir.c
@@ -147,7 +147,7 @@ create_and_bind(const char *addr, const char *port)
 {
     struct addrinfo hints;
     struct addrinfo *result, *rp;
-    int s, listen_sock;
+    int s, listen_sock = -1;
 
     memset(&hints, 0, sizeof(struct addrinfo));
     hints.ai_family   = AF_UNSPEC;   /* Return IPv4 and IPv6 choices */
diff --git a/src/server.c b/src/server.c
index e9cdc2619..073e38b22 100644
--- a/src/server.c
+++ b/src/server.c
@@ -550,7 +550,7 @@ create_and_bind(const char *host, const char *port, int mptcp)
 {
     struct addrinfo hints;
     struct addrinfo *result, *rp, *ipv4v6bindall;
-    int s, listen_sock;
+    int s, listen_sock = -1;
 
     memset(&hints, 0, sizeof(struct addrinfo));
     hints.ai_family   = AF_UNSPEC;               /* Return IPv4 and IPv6 choices */
diff --git a/src/tunnel.c b/src/tunnel.c
index e0886bdb9..6641fe62a 100644
--- a/src/tunnel.c
+++ b/src/tunnel.c
@@ -129,7 +129,7 @@ create_and_bind(const char *addr, const char *port)
 {
     struct addrinfo hints;
     struct addrinfo *result, *rp;
-    int s, listen_sock;
+    int s, listen_sock = -1;
 
     memset(&hints, 0, sizeof(struct addrinfo));
     hints.ai_family   = AF_UNSPEC;   /* Return IPv4 and IPv6 choices */
diff --git a/src/udprelay.c b/src/udprelay.c
index 23a042497..580ad4bd8 100644
--- a/src/udprelay.c
+++ b/src/udprelay.c
@@ -446,7 +446,7 @@ create_server_socket(const char *host, const char *port)
 {
     struct addrinfo hints;
     struct addrinfo *result, *rp, *ipv4v6bindall;
-    int s, server_sock;
+    int s, server_sock = -1;
 
     memset(&hints, 0, sizeof(struct addrinfo));
     hints.ai_family   = AF_UNSPEC;               /* Return IPv4 and IPv6 choices */