diff --git a/features/FEATURE_LWIP/TESTS/mbedmicro-net/tcp_echo_parallel/main.cpp b/features/FEATURE_LWIP/TESTS/mbedmicro-net/tcp_echo_parallel/main.cpp
index a7121cb673..14bdcea016 100644
--- a/features/FEATURE_LWIP/TESTS/mbedmicro-net/tcp_echo_parallel/main.cpp
+++ b/features/FEATURE_LWIP/TESTS/mbedmicro-net/tcp_echo_parallel/main.cpp
@@ -42,6 +42,10 @@ private:
     Thread thread;
 
 public:
+    // Limiting stack size to 1k
+    Echo(): thread(osPriorityNormal, 1024) {
+    }
+
     void start() {
         osStatus status = thread.start(callback(this, &Echo::echo));
         TEST_ASSERT_EQUAL(osOK, status);
diff --git a/features/FEATURE_LWIP/TESTS/mbedmicro-net/udp_echo_parallel/main.cpp b/features/FEATURE_LWIP/TESTS/mbedmicro-net/udp_echo_parallel/main.cpp
index 61327f6e57..b043defaa6 100644
--- a/features/FEATURE_LWIP/TESTS/mbedmicro-net/udp_echo_parallel/main.cpp
+++ b/features/FEATURE_LWIP/TESTS/mbedmicro-net/udp_echo_parallel/main.cpp
@@ -46,6 +46,10 @@ private:
     Thread thread;
 
 public:
+    // Limiting stack size to 1k
+    Echo(): thread(osPriorityNormal, 1024) {
+    }
+
     void start() {
         osStatus status = thread.start(callback(this, &Echo::echo));
         TEST_ASSERT_EQUAL(osOK, status);