diff --git a/compat/mingw.h b/compat/mingw.h
index 9a8803b876a1ed38aca34e83c3859e607bdd17e7..ef22cbb05d140a210bd348ea1234fc60cdf09da8 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -73,6 +73,9 @@ typedef int pid_t;
 #ifndef ECONNABORTED
 #define ECONNABORTED WSAECONNABORTED
 #endif
+#ifndef ENOTSOCK
+#define ENOTSOCK WSAENOTSOCK
+#endif
 
 struct passwd {
 	char *pw_name;
diff --git a/daemon.c b/daemon.c
index 46dddaca5a05a4d50da21c828085168e3ebe8b86..a84495113e4c4e85243937ad0306a17981003c7b 100644
--- a/daemon.c
+++ b/daemon.c
@@ -673,9 +673,11 @@ static void set_keep_alive(int sockfd)
 {
 	int ka = 1;
 
-	if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
-		logerror("unable to set SO_KEEPALIVE on socket: %s",
-			strerror(errno));
+	if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
+		if (errno != ENOTSOCK)
+			logerror("unable to set SO_KEEPALIVE on socket: %s",
+				strerror(errno));
+	}
 }
 
 static int execute(void)