diff --git a/platform/tests/UNITTESTS/doubles/CMakeLists.txt b/platform/tests/UNITTESTS/doubles/CMakeLists.txt
index ac94aab..3171096 100644
--- a/platform/tests/UNITTESTS/doubles/CMakeLists.txt
+++ b/platform/tests/UNITTESTS/doubles/CMakeLists.txt
@@ -35,4 +35,5 @@
         mbed-headers-base
         mbed-headers-hal
         mbed-headers-platform
+        gmock_main
 )
diff --git a/platform/tests/UNITTESTS/doubles/mbed_assert_stub.cpp b/platform/tests/UNITTESTS/doubles/mbed_assert_stub.cpp
index 875ef87..baea5f2 100644
--- a/platform/tests/UNITTESTS/doubles/mbed_assert_stub.cpp
+++ b/platform/tests/UNITTESTS/doubles/mbed_assert_stub.cpp
@@ -16,6 +16,7 @@
  */
 
 #include "platform/mbed_assert.h"
+#include "gtest/gtest.h"
 #include <stdio.h>
 #include <stdbool.h>
 
@@ -27,4 +28,10 @@
     if (mbed_assert_throw_errors) {
         throw 1;
     }
+
+    /* Ensure we fail the unit test if the Mbed assertion fails. Without this,
+     * we might not notice the assertion failure as it wouldn't be bubbled up
+     * to googletest. Note that this is after the above throw, as some tests
+     * check that an exception is thrown (i.e. negative tests). */
+    FAIL();
 }