diff --git a/features/frameworks/utest/TESTS/unit_tests/minimal_async_scheduler/main.cpp b/features/frameworks/utest/TESTS/unit_tests/minimal_async_scheduler/main.cpp
index 3bb4e666c2..0e36ce18c4 100644
--- a/features/frameworks/utest/TESTS/unit_tests/minimal_async_scheduler/main.cpp
+++ b/features/frameworks/utest/TESTS/unit_tests/minimal_async_scheduler/main.cpp
@@ -15,8 +15,6 @@
  * limitations under the License.
  */
 
-// define this to get rid of the minar dependency.
-#define YOTTA_CFG_UTEST_USE_CUSTOM_SCHEDULER 1
 
 #include "mbed.h"
 #include "greentea-client/test_env.h"
diff --git a/features/frameworks/utest/TESTS/unit_tests/minimal_scheduler/main.cpp b/features/frameworks/utest/TESTS/unit_tests/minimal_scheduler/main.cpp
index 4d43bea7bc..2f5299ff8a 100644
--- a/features/frameworks/utest/TESTS/unit_tests/minimal_scheduler/main.cpp
+++ b/features/frameworks/utest/TESTS/unit_tests/minimal_scheduler/main.cpp
@@ -15,8 +15,6 @@
  * limitations under the License.
  */
 
-// define this to get rid of the minar dependency.
-#define YOTTA_CFG_UTEST_USE_CUSTOM_SCHEDULER 1
 
 #include "mbed.h"
 #include "greentea-client/test_env.h"
diff --git a/features/frameworks/utest/source/utest_shim.cpp b/features/frameworks/utest/source/utest_shim.cpp
index 076323e9b1..558e39a483 100644
--- a/features/frameworks/utest/source/utest_shim.cpp
+++ b/features/frameworks/utest/source/utest_shim.cpp
@@ -18,50 +18,9 @@
 
 #include "utest/utest_shim.h"
 #include "utest/utest_stack_trace.h"
-
-#if UTEST_SHIM_SCHEDULER_USE_MINAR
-#include "minar/minar.h"
-
-static int32_t utest_minar_init()
-{
-    return 0;
-}
-static void *utest_minar_post(const utest_v1_harness_callback_t callback, const uint32_t delay_ms)
-{
-    void *handle = minar::Scheduler::postCallback(callback).delay(minar::milliseconds(delay_ms)).getHandle();
-    return handle;
-}
-static int32_t utest_minar_cancel(void *handle)
-{
-    int32_t ret = minar::Scheduler::cancelCallback(handle);
-    return ret;
-}
-static int32_t utest_minar_run()
-{
-    return 0;
-}
-extern "C" {
-static const utest_v1_scheduler_t utest_v1_scheduler =
-{
-    utest_minar_init,
-    utest_minar_post,
-    utest_minar_cancel,
-    utest_minar_run
-};
-utest_v1_scheduler_t utest_v1_get_scheduler()
-{
-    return utest_v1_scheduler;
-}
-}
-
-#elif UTEST_SHIM_SCHEDULER_USE_US_TICKER
-#ifdef YOTTA_MBED_HAL_VERSION_STRING
-#   include "mbed-hal/us_ticker_api.h"
-#else
 #include "platform/SingletonPtr.h"
 #include "Timeout.h"
 using mbed::Timeout;
-#endif
 
 // only one callback is active at any given time
 static volatile utest_v1_harness_callback_t minimal_callback;
@@ -79,7 +38,7 @@ static void ticker_handler()
 static int32_t utest_us_ticker_init()
 {
     UTEST_LOG_FUNCTION();
-    // initialize the Timeout object to makes sure it is not initialized in 
+    // initialize the Timeout object to makes sure it is not initialized in
     // interrupt context.
     utest_timeout_object.get();
     return 0;
@@ -88,13 +47,13 @@ static void *utest_us_ticker_post(const utest_v1_harness_callback_t callback, ti
 {
     UTEST_LOG_FUNCTION();
     timestamp_t delay_us = delay_ms *1000;
-    
+
     if (delay_ms) {
         ticker_callback = callback;
         // fire the interrupt in 1000us * delay_ms
         utest_timeout_object->attach_us(ticker_handler, delay_us);
-        
-    } 
+
+    }
     else {
         minimal_callback = callback;
     }
@@ -142,10 +101,3 @@ utest_v1_scheduler_t utest_v1_get_scheduler()
     return utest_v1_scheduler;
 }
 }
-#endif
-
-#ifdef YOTTA_CORE_UTIL_VERSION_STRING
-// their functionality is implemented using the CriticalSectionLock class
-void utest_v1_enter_critical_section(void) {}
-void utest_v1_leave_critical_section(void) {}
-#endif
diff --git a/features/frameworks/utest/utest/utest_harness.h b/features/frameworks/utest/utest/utest_harness.h
index 335bbe4f0d..2f0bdbe6d8 100644
--- a/features/frameworks/utest/utest/utest_harness.h
+++ b/features/frameworks/utest/utest/utest_harness.h
@@ -41,11 +41,6 @@ namespace v1 {
      * The harness executes the test specification in an asynchronous fashion, therefore
      * `run()` returns immediately.
      *
-     * By default, this harness uses the MINAR scheduler for asynchronous callbacks.
-     * If you wamt to provide your own custom scheduler, set `config.utest.use_custom_scheduler` to `true`
-     * inside your yotta config and set a custom scheduler implementation using the `set_scheduler()` function.
-     * You must set the scheduler before running a specification.
-     *
      * @note In case of an test abort, the harness will busy-wait and never finish.
      */
     class Harness
diff --git a/features/frameworks/utest/utest/utest_shim.h b/features/frameworks/utest/utest/utest_shim.h
index 1da90c08f2..7f084223b2 100644
--- a/features/frameworks/utest/utest/utest_shim.h
+++ b/features/frameworks/utest/utest/utest_shim.h
@@ -27,50 +27,22 @@
 #include <stdio.h>
 #include "utest/utest_scheduler.h"
 
-#ifdef YOTTA_CFG
-#   include "compiler-polyfill/attributes.h"
-#else
-#   ifndef __deprecated_message
-#       if defined(__CC_ARM)
-#           define __deprecated_message(msg) __attribute__((deprecated))
-#       elif defined (__ICCARM__)
-#           define __deprecated_message(msg)
-#       else
-#           define __deprecated_message(msg) __attribute__((deprecated(msg)))
-#       endif
-#   endif
-#endif
-
-#ifdef YOTTA_CORE_UTIL_VERSION_STRING
-#   include "core-util/CriticalSectionLock.h"
-#   define UTEST_ENTER_CRITICAL_SECTION mbed::util::CriticalSectionLock lock
-#   define UTEST_LEAVE_CRITICAL_SECTION
-#else
-#   ifndef UTEST_ENTER_CRITICAL_SECTION
-#   	define UTEST_ENTER_CRITICAL_SECTION utest_v1_enter_critical_section()
-#   endif
-#   ifndef UTEST_LEAVE_CRITICAL_SECTION
-#   	define UTEST_LEAVE_CRITICAL_SECTION utest_v1_leave_critical_section()
-#   endif
-#endif
-
-#ifndef YOTTA_CFG_UTEST_USE_CUSTOM_SCHEDULER
-#   ifdef YOTTA_MINAR_VERSION_STRING
-#       define UTEST_MINAR_AVAILABLE 1
+#ifndef __deprecated_message
+#   if defined(__CC_ARM)
+#       define __deprecated_message(msg) __attribute__((deprecated))
+#   elif defined (__ICCARM__)
+#       define __deprecated_message(msg)
 #   else
-#       define UTEST_MINAR_AVAILABLE 0
+#       define __deprecated_message(msg) __attribute__((deprecated(msg)))
 #   endif
-#   ifndef UTEST_SHIM_SCHEDULER_USE_MINAR
-#       define UTEST_SHIM_SCHEDULER_USE_MINAR UTEST_MINAR_AVAILABLE
-#   endif
-#   ifndef UTEST_SHIM_SCHEDULER_USE_US_TICKER
-#       ifdef __MBED__
-#           define UTEST_SHIM_SCHEDULER_USE_US_TICKER 1
-#       else
-#           define UTEST_SHIM_SCHEDULER_USE_US_TICKER 0
-#       endif
-#   endif
-#endif  // YOTTA_CFG_UTEST_USE_CUSTOM_SCHEDULER
+#endif
+
+#ifndef UTEST_ENTER_CRITICAL_SECTION
+#	define UTEST_ENTER_CRITICAL_SECTION utest_v1_enter_critical_section()
+#endif
+#ifndef UTEST_LEAVE_CRITICAL_SECTION
+#	define UTEST_LEAVE_CRITICAL_SECTION utest_v1_leave_critical_section()
+#endif
 
 #ifdef __cplusplus
 extern "C" {