diff --git a/tests/net/lib/lwm2m/lwm2m_engine/boards/native_posix.conf b/tests/net/lib/lwm2m/lwm2m_engine/boards/native_posix.conf
deleted file mode 100644
index eb56d825c96..00000000000
--- a/tests/net/lib/lwm2m/lwm2m_engine/boards/native_posix.conf
+++ /dev/null
@@ -1 +0,0 @@
-CONFIG_NATIVE_POSIX_SLOWDOWN_TO_REAL_TIME=y
diff --git a/tests/net/lib/lwm2m/lwm2m_engine/boards/native_sim.conf b/tests/net/lib/lwm2m/lwm2m_engine/boards/native_sim.conf
new file mode 100644
index 00000000000..0843e94acbd
--- /dev/null
+++ b/tests/net/lib/lwm2m/lwm2m_engine/boards/native_sim.conf
@@ -0,0 +1 @@
+CONFIG_NATIVE_SIM_SLOWDOWN_TO_REAL_TIME=y
diff --git a/tests/net/lib/lwm2m/lwm2m_engine/testcase.yaml b/tests/net/lib/lwm2m/lwm2m_engine/testcase.yaml
index a7f628405eb..2f765ac0dc1 100644
--- a/tests/net/lib/lwm2m/lwm2m_engine/testcase.yaml
+++ b/tests/net/lib/lwm2m/lwm2m_engine/testcase.yaml
@@ -6,4 +6,4 @@ tests:
       - lwm2m
       - net
     integration_platforms:
-      - native_posix
+      - native_sim