diff --git a/src/CLR/CorLib/corlib_native.cpp b/src/CLR/CorLib/corlib_native.cpp
index 4fb9a855de..2f9859f310 100644
--- a/src/CLR/CorLib/corlib_native.cpp
+++ b/src/CLR/CorLib/corlib_native.cpp
@@ -274,9 +274,8 @@ static const CLR_RT_MethodHandler method_lookup[] =
     Library_corlib_native_System_Console::OutNative___STATIC__VOID__STRING__BOOLEAN,
     NULL,
     NULL,
-    NULL,
-    NULL,
-    NULL,
+    Library_corlib_native_System_Convert::NativeToInt64___STATIC__I8__STRING__BOOLEAN__I8__I8__I4,
+    Library_corlib_native_System_Convert::NativeToDouble___STATIC__R8__STRING,
     NULL,
     NULL,
     NULL,
@@ -901,6 +900,7 @@ static const CLR_RT_MethodHandler method_lookup[] =
 const CLR_RT_NativeAssemblyData g_CLR_AssemblyNative_mscorlib =
 {
     "mscorlib", 
-    0x964C8465,
+    0x7D73728E,
     method_lookup
 };
+
diff --git a/src/CLR/CorLib/corlib_native.h b/src/CLR/CorLib/corlib_native.h
index d89e9ac2b7..4df4cd3f7a 100644
--- a/src/CLR/CorLib/corlib_native.h
+++ b/src/CLR/CorLib/corlib_native.h
@@ -8,6 +8,10 @@
 #ifndef _CORLIB_NATIVE_H_
 #define _CORLIB_NATIVE_H_
 
+#include <nanoCLR_Interop.h>
+#include <nanoCLR_Runtime.h>
+#include <nanoCLR_Checks.h>
+
 struct Library_corlib_native_System_Object
 {
     NANOCLR_NATIVE_DECLARE(Equals___BOOLEAN__OBJECT);
@@ -313,6 +317,8 @@ struct Library_corlib_native_System_Console
 
 struct Library_corlib_native_System_Convert
 {
+	NANOCLR_NATIVE_DECLARE(NativeToInt64___STATIC__I8__STRING__BOOLEAN__I8__I8__I4);
+    NANOCLR_NATIVE_DECLARE(NativeToDouble___STATIC__R8__STRING);
     NANOCLR_NATIVE_DECLARE(ToBase64String___STATIC__STRING__SZARRAY_U1__I4__I4__BOOLEAN);
     NANOCLR_NATIVE_DECLARE(FromBase64CharArray___STATIC__SZARRAY_U1__SZARRAY_CHAR__I4);
 
diff --git a/src/CLR/CorLib/corlib_native_System_Convert.cpp b/src/CLR/CorLib/corlib_native_System_Convert.cpp
index 0bb378ac37..6be56e8139 100644
--- a/src/CLR/CorLib/corlib_native_System_Convert.cpp
+++ b/src/CLR/CorLib/corlib_native_System_Convert.cpp
@@ -3,8 +3,38 @@
 // Portions Copyright (c) Microsoft Corporation.  All rights reserved.
 // See LICENSE file in the project root for full license information.
 //
-#include "CorLib.h"
+#include "corlib_native.h"
 
+HRESULT Library_corlib_native_System_Convert::NativeToInt64___STATIC__I8__STRING__BOOLEAN__I8__I8__I4( CLR_RT_StackFrame& stack )
+{
+    NANOCLR_HEADER();
+    {
+        CLR_INT64 _result = 0;
+        CLR_INT64 _zero = 0;
+
+		const char * _string = stack.Arg0().RecoverString();
+        bool _signed = (bool)stack.Arg1().NumericByRef().u1;
+        long long _minValue = stack.Arg2().NumericByRef().s8;
+        long long _maxValue = stack.Arg3().NumericByRef().s8;
+        signed int radix = stack.Arg4().NumericByRef().s4;
+
+        _result = _signed ? strtoll(_string, nullptr, radix) : (long long) strtoull(_string, nullptr, radix);
+
+        stack.SetResult_I8 ((_result > _maxValue || _result < _minValue) ? _zero : _result);
+	}
+    NANOCLR_NOCLEANUP();
+}
+
+HRESULT Library_corlib_native_System_Convert::NativeToDouble___STATIC__R8__STRING( CLR_RT_StackFrame& stack )
+{
+    NANOCLR_HEADER();
+    {
+		const char * _string = stack.Arg0().RecoverString();
+
+        stack.SetResult_R8 (strtod(_string, nullptr));
+	}
+    NANOCLR_NOCLEANUP();
+}
 
 HRESULT Library_corlib_native_System_Convert::ToBase64String___STATIC__STRING__SZARRAY_U1__I4__I4__BOOLEAN( CLR_RT_StackFrame& stack )
 {
diff --git a/targets/CMSIS-OS/ChibiOS/ST_STM32F429I_DISCOVERY/CMakeLists.txt b/targets/CMSIS-OS/ChibiOS/ST_STM32F429I_DISCOVERY/CMakeLists.txt
index 7e0122edcd..baec2ea263 100644
--- a/targets/CMSIS-OS/ChibiOS/ST_STM32F429I_DISCOVERY/CMakeLists.txt
+++ b/targets/CMSIS-OS/ChibiOS/ST_STM32F429I_DISCOVERY/CMakeLists.txt
@@ -199,7 +199,7 @@ set_property(TARGET ${NANOCLR_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAG
 # the size of the CLR managed heap is defined here
 ###################################################
 set_property(TARGET ${NANOBOOTER_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAGS ",--library-path=${PROJECT_SOURCE_DIR}/targets/CMSIS-OS/ChibiOS/common,--defsym=__main_stack_size__=0x400,--defsym=__process_stack_size__=0x400,--defsym=__clr_managed_heap_size__=0x0")
-set_property(TARGET ${NANOCLR_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAGS ",--library-path=${PROJECT_SOURCE_DIR}/targets/CMSIS-OS/ChibiOS/common,--defsym=__main_stack_size__=0x400,--defsym=__process_stack_size__=0x400,--defsym=__clr_managed_heap_size__=0x29900")
+set_property(TARGET ${NANOCLR_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAGS ",--library-path=${PROJECT_SOURCE_DIR}/targets/CMSIS-OS/ChibiOS/common,--defsym=__main_stack_size__=0x400,--defsym=__process_stack_size__=0x400,--defsym=__clr_managed_heap_size__=0x29600")
 
 
 set(NANOBOOTER_HEX_FILE ${PROJECT_SOURCE_DIR}/build/${NANOBOOTER_PROJECT_NAME}.hex)
diff --git a/targets/CMSIS-OS/ChibiOS/ST_STM32F4_DISCOVERY/CMakeLists.txt b/targets/CMSIS-OS/ChibiOS/ST_STM32F4_DISCOVERY/CMakeLists.txt
index b032017c8e..568cf1609e 100644
--- a/targets/CMSIS-OS/ChibiOS/ST_STM32F4_DISCOVERY/CMakeLists.txt
+++ b/targets/CMSIS-OS/ChibiOS/ST_STM32F4_DISCOVERY/CMakeLists.txt
@@ -199,7 +199,7 @@ set_property(TARGET ${NANOCLR_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAG
 # the size of the CLR managed heap is defined here
 ###################################################
 set_property(TARGET ${NANOBOOTER_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAGS ",--library-path=${PROJECT_SOURCE_DIR}/targets/CMSIS-OS/ChibiOS/common,--defsym=__main_stack_size__=0x400,--defsym=__process_stack_size__=0x400,--defsym=__clr_managed_heap_size__=0x0")
-set_property(TARGET ${NANOCLR_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAGS ",--library-path=${PROJECT_SOURCE_DIR}/targets/CMSIS-OS/ChibiOS/common,--defsym=__main_stack_size__=0x400,--defsym=__process_stack_size__=0x400,--defsym=__clr_managed_heap_size__=0x199E0")
+set_property(TARGET ${NANOCLR_PROJECT_NAME}.elf APPEND_STRING PROPERTY LINK_FLAGS ",--library-path=${PROJECT_SOURCE_DIR}/targets/CMSIS-OS/ChibiOS/common,--defsym=__main_stack_size__=0x400,--defsym=__process_stack_size__=0x400,--defsym=__clr_managed_heap_size__=0x196E0")
 
 
 set(NANOBOOTER_HEX_FILE ${PROJECT_SOURCE_DIR}/build/${NANOBOOTER_PROJECT_NAME}.hex)