diff --git a/src/app/DeviceProxy.cpp b/src/app/DeviceProxy.cpp
index 8488e78f24f9f5..b3618742a55961 100644
--- a/src/app/DeviceProxy.cpp
+++ b/src/app/DeviceProxy.cpp
@@ -46,4 +46,15 @@ CHIP_ERROR DeviceProxy::SendCommands(app::CommandSender * commandObj, Optional<S
     return commandObj->SendCommandRequest(GetSecureSession().Value(), timeout);
 }
 
+CHIP_ERROR DeviceProxy::GetAttestationChallenge(ByteSpan & attestationChallenge)
+{
+    Optional<SessionHandle> secureSessionHandle;
+
+    secureSessionHandle = GetSecureSession();
+    VerifyOrReturnError(secureSessionHandle.HasValue(), CHIP_ERROR_INCORRECT_STATE);
+
+    attestationChallenge = secureSessionHandle.Value()->AsSecureSession()->GetCryptoContext().GetAttestationChallenge();
+    return CHIP_NO_ERROR;
+}
+
 } // namespace chip
diff --git a/src/app/DeviceProxy.h b/src/app/DeviceProxy.h
index 843ebd9d364111..3f4bdb89649cc7 100644
--- a/src/app/DeviceProxy.h
+++ b/src/app/DeviceProxy.h
@@ -67,16 +67,7 @@ class DLL_EXPORT DeviceProxy
      *
      * @return CHIP_ERROR               CHIP_NO_ERROR on success, or CHIP_ERROR_INVALID_ARGUMENT if no secure session is active
      */
-    virtual CHIP_ERROR GetAttestationChallenge(ByteSpan & attestationChallenge)
-    {
-        Optional<SessionHandle> secureSessionHandle;
-
-        secureSessionHandle = GetSecureSession();
-        VerifyOrReturnError(secureSessionHandle.HasValue(), CHIP_ERROR_INCORRECT_STATE);
-
-        attestationChallenge = secureSessionHandle.Value()->AsSecureSession()->GetCryptoContext().GetAttestationChallenge();
-        return CHIP_NO_ERROR;
-    }
+    virtual CHIP_ERROR GetAttestationChallenge(ByteSpan & attestationChallenge);
 
 protected:
     virtual bool IsSecureConnected() const = 0;