diff --git a/pkg/interfaces/tcp_common.go b/pkg/interfaces/tcp_common.go
index 1763e27..622cceb 100644
--- a/pkg/interfaces/tcp_common.go
+++ b/pkg/interfaces/tcp_common.go
@@ -2,3 +2,13 @@
 // +build !linux
 
 package interfaces
+
+import (
+	"time"
+)
+
+// platformGetRTT is defined in OS-specific files
+// Default implementation for non-Linux platforms
+func platformGetRTT(fd uintptr) time.Duration {
+	return 0
+}
diff --git a/pkg/interfaces/tcp_darwin.go b/pkg/interfaces/tcp_darwin.go
index 88273e3..c02d867 100644
--- a/pkg/interfaces/tcp_darwin.go
+++ b/pkg/interfaces/tcp_darwin.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"net"
 	"syscall"
-	"time"
 
 	"github.com/Sudo-Ivan/reticulum-go/pkg/debug"
 )
@@ -58,7 +57,3 @@ func (tc *TCPClientInterface) setTimeoutsOSX() error {
 	return nil
 }
 
-func platformGetRTT(fd uintptr) time.Duration {
-	return 0
-}
-
diff --git a/pkg/interfaces/tcp_freebsd.go b/pkg/interfaces/tcp_freebsd.go
index b5920c1..caabd8b 100644
--- a/pkg/interfaces/tcp_freebsd.go
+++ b/pkg/interfaces/tcp_freebsd.go
@@ -37,7 +37,3 @@ func (tc *TCPClientInterface) setTimeoutsOSX() error {
 	return tc.setTimeoutsLinux()
 }
 
-func platformGetRTT(fd uintptr) time.Duration {
-	return 0
-}
-
diff --git a/pkg/interfaces/tcp_windows.go b/pkg/interfaces/tcp_windows.go
index 489f0d6..c81f001 100644
--- a/pkg/interfaces/tcp_windows.go
+++ b/pkg/interfaces/tcp_windows.go
@@ -39,7 +39,4 @@ func (tc *TCPClientInterface) setTimeoutsWindows() error {
 	return nil
 }
 
-func platformGetRTT(fd uintptr) time.Duration {
-	return 0
-}