diff --git a/src/Simplex/Messaging/Transport/KeepAlive.hs b/src/Simplex/Messaging/Transport/KeepAlive.hs
index 1d34a27f0a..417865bae2 100644
--- a/src/Simplex/Messaging/Transport/KeepAlive.hs
+++ b/src/Simplex/Messaging/Transport/KeepAlive.hs
@@ -35,30 +35,33 @@ _SOL_TCP = 6
 
 #if defined(mingw32_HOST_OS)
 -- Windows
-
--- The values are copied from windows::Win32::Networking::WinSock
--- https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/Networking/WinSock/index.html
-
 _TCP_KEEPIDLE :: CInt
 _TCP_KEEPIDLE = 3
-
 _TCP_KEEPINTVL :: CInt
 _TCP_KEEPINTVL = 17
-
 _TCP_KEEPCNT :: CInt
 _TCP_KEEPCNT = 16
 
-#else
--- Mac/Linux
-
-#if defined(darwin_HOST_OS)
+#elif defined(darwin_HOST_OS)
+-- macOS (Darwin)
 foreign import capi "netinet/tcp.h value TCP_KEEPALIVE" _TCP_KEEPIDLE :: CInt
+foreign import capi "netinet/tcp.h value TCP_KEEPINTVL" _TCP_KEEPINTVL :: CInt
+foreign import capi "netinet/tcp.h value TCP_KEEPCNT" _TCP_KEEPCNT :: CInt
+
+#elif defined(openbsd_HOST_OS)
+-- OpenBSD: These constants are not directly available via setsockopt in the same way.
+-- We define dummy values to satisfy compilation, but note that these options may be ignored or unsupported.
+_TCP_KEEPIDLE :: CInt
+_TCP_KEEPIDLE = 0 -- Dummy value; OpenBSD does not support per-socket keepalive tuning via TCP_* options
+_TCP_KEEPINTVL :: CInt
+_TCP_KEEPINTVL = 0
+_TCP_KEEPCNT :: CInt
+_TCP_KEEPCNT = 0
+
 #else
+-- Linux and other Unix-like systems (FreeBSD, NetBSD, etc.)
 foreign import capi "netinet/tcp.h value TCP_KEEPIDLE" _TCP_KEEPIDLE :: CInt
-#endif
-
 foreign import capi "netinet/tcp.h value TCP_KEEPINTVL" _TCP_KEEPINTVL :: CInt
-
 foreign import capi "netinet/tcp.h value TCP_KEEPCNT" _TCP_KEEPCNT :: CInt
 
 #endif
@@ -66,8 +69,12 @@ foreign import capi "netinet/tcp.h value TCP_KEEPCNT" _TCP_KEEPCNT :: CInt
 setSocketKeepAlive :: Socket -> KeepAliveOpts -> IO ()
 setSocketKeepAlive sock KeepAliveOpts {keepCnt, keepIdle, keepIntvl} = do
   setSocketOption sock KeepAlive 1
+#if defined(openbsd_HOST_OS)
+  -- On OpenBSD, these options are typically ignored. We skip them to avoid errors.
+#else
   setSocketOption sock (SockOpt _SOL_TCP _TCP_KEEPIDLE) keepIdle
   setSocketOption sock (SockOpt _SOL_TCP _TCP_KEEPINTVL) keepIntvl
   setSocketOption sock (SockOpt _SOL_TCP _TCP_KEEPCNT) keepCnt
+#endif
 
 $(J.deriveJSON defaultJSON ''KeepAliveOpts)