diff --git a/quinn/Cargo.toml b/quinn/Cargo.toml
index fe67f2c51..aa19a7ca9 100644
--- a/quinn/Cargo.toml
+++ b/quinn/Cargo.toml
@@ -31,7 +31,7 @@ azure-devops = { project = "dochtman/Projects", pipeline = "Quinn", build = "1"
 bytes = "0.5.2"
 err-derive = "0.2.3"
 futures = "0.3.1"
-libc = "0.2.49"
+libc = "0.2.67"
 mio = "0.6"
 proto = { package = "quinn-proto", path = "../quinn-proto", version = "0.5.0" }
 rustls = { version = "0.17", features = ["quic"], optional = true }
diff --git a/quinn/src/platform/unix.rs b/quinn/src/platform/unix.rs
index 1e4245e04..3955309f2 100644
--- a/quinn/src/platform/unix.rs
+++ b/quinn/src/platform/unix.rs
@@ -53,6 +53,39 @@ impl super::UdpExt for UdpSocket {
                 return Err(io::Error::last_os_error());
             }
         }
+        #[cfg(target_os = "linux")]
+        {
+            // TODO: Replace with constants from libc > 0.2.67
+            const IP_PMTUDISC_PROBE: libc::c_int = 2;
+            if addr.is_ipv4() {
+                const IP_MTU_DISCOVER: libc::c_int = 10;
+                let rc = unsafe {
+                    libc::setsockopt(
+                        self.as_raw_fd(),
+                        libc::IPPROTO_IP,
+                        IP_MTU_DISCOVER,
+                        &IP_PMTUDISC_PROBE as *const _ as _,
+                        mem::size_of_val(&IP_PMTUDISC_PROBE) as _,
+                    )
+                };
+                if rc == -1 {
+                    return Err(io::Error::last_os_error());
+                }
+            } else if addr.is_ipv6() {
+                let rc = unsafe {
+                    libc::setsockopt(
+                        self.as_raw_fd(),
+                        libc::IPPROTO_IPV6,
+                        libc::IPV6_MTU_DISCOVER,
+                        &IP_PMTUDISC_PROBE as *const _ as _,
+                        mem::size_of_val(&IP_PMTUDISC_PROBE) as _,
+                    )
+                };
+                if rc == -1 {
+                    return Err(io::Error::last_os_error());
+                }
+            }
+        }
         if addr.is_ipv6() {
             let on: libc::c_int = 1;
             let rc = unsafe {