diff --git a/mongoose.c b/mongoose.c
index 75ee5b89..7b734d2f 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -4109,8 +4109,8 @@ static long mg_sock_send(struct mg_connection *c, const void *buf, size_t len) {
 bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
   if (c->is_udp) {
     long n = mg_sock_send(c, buf, len);
-    MG_DEBUG(("%lu %p %d:%d %ld err %d (%s)", c->id, c->fd, (int) c->send.len,
-              (int) c->recv.len, n, MG_SOCK_ERRNO, strerror(errno)));
+    MG_DEBUG(("%lu %p %d:%d %ld err %d", c->id, c->fd, (int) c->send.len,
+              (int) c->recv.len, n, MG_SOCK_ERRNO));
     iolog(c, (char *) buf, n, false);
     return n > 0;
   } else {
@@ -4234,8 +4234,8 @@ static void read_conn(struct mg_connection *c) {
     char *buf = (char *) &c->recv.buf[c->recv.len];
     size_t len = c->recv.size - c->recv.len;
     n = c->is_tls ? mg_tls_recv(c, buf, len) : mg_sock_recv(c, buf, len);
-    MG_DEBUG(("%lu %p %d:%d %ld err %d (%s)", c->id, c->fd, (int) c->send.len,
-              (int) c->recv.len, n, MG_SOCK_ERRNO, strerror(errno)));
+    MG_DEBUG(("%lu %p %d:%d %ld err %d", c->id, c->fd, (int) c->send.len,
+              (int) c->recv.len, n, MG_SOCK_ERRNO));
     iolog(c, buf, n, true);
   }
 }
@@ -4244,8 +4244,8 @@ static void write_conn(struct mg_connection *c) {
   char *buf = (char *) c->send.buf;
   size_t len = c->send.len;
   long n = c->is_tls ? mg_tls_send(c, buf, len) : mg_sock_send(c, buf, len);
-  MG_DEBUG(("%lu %p %d:%d %ld err %d (%s)", c->id, c->fd, (int) c->send.len,
-            (int) c->recv.len, n, MG_SOCK_ERRNO, strerror(errno)));
+  MG_DEBUG(("%lu %p %d:%d %ld err %d", c->id, c->fd, (int) c->send.len,
+            (int) c->recv.len, n, MG_SOCK_ERRNO));
   iolog(c, buf, n, false);
 }
 
diff --git a/src/sock.c b/src/sock.c
index 8e50b945..38460b83 100644
--- a/src/sock.c
+++ b/src/sock.c
@@ -162,8 +162,8 @@ static long mg_sock_send(struct mg_connection *c, const void *buf, size_t len) {
 bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
   if (c->is_udp) {
     long n = mg_sock_send(c, buf, len);
-    MG_DEBUG(("%lu %p %d:%d %ld err %d (%s)", c->id, c->fd, (int) c->send.len,
-              (int) c->recv.len, n, MG_SOCK_ERRNO, strerror(errno)));
+    MG_DEBUG(("%lu %p %d:%d %ld err %d", c->id, c->fd, (int) c->send.len,
+              (int) c->recv.len, n, MG_SOCK_ERRNO));
     iolog(c, (char *) buf, n, false);
     return n > 0;
   } else {
@@ -287,8 +287,8 @@ static void read_conn(struct mg_connection *c) {
     char *buf = (char *) &c->recv.buf[c->recv.len];
     size_t len = c->recv.size - c->recv.len;
     n = c->is_tls ? mg_tls_recv(c, buf, len) : mg_sock_recv(c, buf, len);
-    MG_DEBUG(("%lu %p %d:%d %ld err %d (%s)", c->id, c->fd, (int) c->send.len,
-              (int) c->recv.len, n, MG_SOCK_ERRNO, strerror(errno)));
+    MG_DEBUG(("%lu %p %d:%d %ld err %d", c->id, c->fd, (int) c->send.len,
+              (int) c->recv.len, n, MG_SOCK_ERRNO));
     iolog(c, buf, n, true);
   }
 }
@@ -297,8 +297,8 @@ static void write_conn(struct mg_connection *c) {
   char *buf = (char *) c->send.buf;
   size_t len = c->send.len;
   long n = c->is_tls ? mg_tls_send(c, buf, len) : mg_sock_send(c, buf, len);
-  MG_DEBUG(("%lu %p %d:%d %ld err %d (%s)", c->id, c->fd, (int) c->send.len,
-            (int) c->recv.len, n, MG_SOCK_ERRNO, strerror(errno)));
+  MG_DEBUG(("%lu %p %d:%d %ld err %d", c->id, c->fd, (int) c->send.len,
+            (int) c->recv.len, n, MG_SOCK_ERRNO));
   iolog(c, buf, n, false);
 }