diff --git a/vlib/net/tcp.v b/vlib/net/tcp.v
index 28bc992993..39e61fe467 100644
--- a/vlib/net/tcp.v
+++ b/vlib/net/tcp.v
@@ -298,17 +298,19 @@ fn new_tcp_socket() ?TcpSocket {
 	mut s := TcpSocket{
 		handle: sockfd
 	}
-	// s.set_option_bool(.reuse_addr, true)?
-	s.set_option_int(.reuse_addr, 1) ?
-	$if windows {
-		t := u32(1) // true
-		socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
-	} $else {
-		socket_error(C.fcntl(sockfd, C.F_SETFL, C.fcntl(sockfd, C.F_GETFL) | C.O_NONBLOCK)) ?
-	}
 	$if trace_tcp ? {
 		eprintln('    new_tcp_socket | s.handle: ${s.handle:6}')
 	}
+	// s.set_option_bool(.reuse_addr, true)?
+	s.set_option_int(.reuse_addr, 1) ?
+	$if !net_blocking_sockets ? {
+		$if windows {
+			t := u32(1) // true
+			socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
+		} $else {
+			socket_error(C.fcntl(sockfd, C.F_SETFL, C.fcntl(sockfd, C.F_GETFL) | C.O_NONBLOCK)) ?
+		}
+	}
 	return s
 }
 
@@ -316,17 +318,19 @@ fn tcp_socket_from_handle(sockfd int) ?TcpSocket {
 	mut s := TcpSocket{
 		handle: sockfd
 	}
-	// s.set_option_bool(.reuse_addr, true)?
-	s.set_option_int(.reuse_addr, 1) ?
-	$if windows {
-		t := u32(1) // true
-		socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
-	} $else {
-		socket_error(C.fcntl(sockfd, C.F_SETFL, C.fcntl(sockfd, C.F_GETFL) | C.O_NONBLOCK)) ?
-	}
 	$if trace_tcp ? {
 		eprintln('    tcp_socket_from_handle | s.handle: ${s.handle:6}')
 	}
+	// s.set_option_bool(.reuse_addr, true)?
+	s.set_option_int(.reuse_addr, 1) ?
+	$if !net_blocking_sockets ? {
+		$if windows {
+			t := u32(1) // true
+			socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
+		} $else {
+			socket_error(C.fcntl(sockfd, C.F_SETFL, C.fcntl(sockfd, C.F_GETFL) | C.O_NONBLOCK)) ?
+		}
+	}
 	return s
 }
 
diff --git a/vlib/net/udp.v b/vlib/net/udp.v
index f0e81734b2..9e4976eb0d 100644
--- a/vlib/net/udp.v
+++ b/vlib/net/udp.v
@@ -185,11 +185,13 @@ fn new_udp_socket(local_port int) ?&UdpSocket {
 		handle: sockfd
 	}
 	s.set_option_bool(.reuse_addr, true) ?
-	$if windows {
-		t := u32(1) // true
-		socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
-	} $else {
-		socket_error(C.fcntl(sockfd, C.F_SETFD, C.O_NONBLOCK)) ?
+	$if !net_blocking_sockets ? {
+		$if windows {
+			t := u32(1) // true
+			socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
+		} $else {
+			socket_error(C.fcntl(sockfd, C.F_SETFD, C.O_NONBLOCK)) ?
+		}
 	}
 	// In UDP we always have to bind to a port
 	validate_port(local_port) ?