diff --git a/lib/std/posix.zig b/lib/std/posix.zig
index 4176910537..ec35baa07c 100644
--- a/lib/std/posix.zig
+++ b/lib/std/posix.zig
@@ -3635,6 +3635,9 @@ pub const GetSockNameError = error{
     SocketNotBound,
 
     FileDescriptorNotASocket,
+
+    /// The socket is not connected (connection-oriented sockets only).
+    SocketUnconnected,
 } || UnexpectedError;
 
 pub fn getsockname(sock: socket_t, addr: *sockaddr, addrlen: *socklen_t) GetSockNameError!void {
@@ -3676,6 +3679,7 @@ pub fn getpeername(sock: socket_t, addr: *sockaddr, addrlen: *socklen_t) GetSock
                 .EFAULT => unreachable, // addr or addrlen have invalid pointers or addrlen points to an incorrect value
                 .ENOTSOCK => return error.FileDescriptorNotASocket,
                 .EINVAL => return error.SocketNotBound,
+                .ENOTCONN => return error.SocketUnconnected,
                 else => |err| return windows.unexpectedWSAError(err),
             }
         }
@@ -3691,6 +3695,7 @@ pub fn getpeername(sock: socket_t, addr: *sockaddr, addrlen: *socklen_t) GetSock
             .INVAL => unreachable, // invalid parameters
             .NOTSOCK => return error.FileDescriptorNotASocket,
             .NOBUFS => return error.SystemResources,
+            .NOTCONN => return error.SocketUnconnected,
         }
     }
 }