diff --git a/platform/CriticalSectionLock.h b/platform/CriticalSectionLock.h
index e1e66f7a64..3f9aa6200c 100644
--- a/platform/CriticalSectionLock.h
+++ b/platform/CriticalSectionLock.h
@@ -59,24 +59,6 @@ public:
 
     ~CriticalSectionLock();
 
-    /** Mark the start of a critical section
-     *  @deprecated This function is inconsistent with RAII and is being removed in the future. Replaced by static function CriticalSectionLock::enable.
-     *
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.8",
-                          "This function is inconsistent with RAII and is being removed in the future."
-                          "Replaced by static function CriticalSectionLock::enable.")
-    void lock();
-
-    /** Mark the end of a critical section
-     *  @deprecated This function is inconsistent with RAII and is being removed in the future. Replaced by static function CriticalSectionLock::enable.
-     *
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.8",
-                          "This function is inconsistent with RAII and is being removed in the future."
-                          "Replaced by static function CriticalSectionLock::disable.")
-    void unlock();
-
     /** Mark the start of a critical section
      */
     static void enable();
diff --git a/platform/source/CriticalSectionLock.cpp b/platform/source/CriticalSectionLock.cpp
index 61e775ce39..506c073e55 100644
--- a/platform/source/CriticalSectionLock.cpp
+++ b/platform/source/CriticalSectionLock.cpp
@@ -30,16 +30,6 @@ CriticalSectionLock::~CriticalSectionLock()
     core_util_critical_section_exit();
 }
 
-void CriticalSectionLock::lock()
-{
-    core_util_critical_section_enter();
-}
-
-void CriticalSectionLock::unlock()
-{
-    core_util_critical_section_exit();
-}
-
 void CriticalSectionLock::enable()
 {
     core_util_critical_section_enter();