diff --git a/demos/various/RT-Posix-Simulator/Makefile b/demos/various/RT-Posix-Simulator/Makefile
index a4906141f..b9f106d47 100755
--- a/demos/various/RT-Posix-Simulator/Makefile
+++ b/demos/various/RT-Posix-Simulator/Makefile
@@ -25,7 +25,7 @@ endif
 
 # Linker extra options here.
 ifeq ($(USE_LDOPT),)
-  USE_LDOPT = 
+  USE_LDOPT = --defsym=__main_thread_stack_base__=0,--defsym=__main_thread_stack_end__=0
 endif
 
 # Enable this if you want link time optimizations (LTO).
diff --git a/demos/various/RT-Win32-Simulator/Makefile b/demos/various/RT-Win32-Simulator/Makefile
index 4bb9801e4..697bd0fdb 100644
--- a/demos/various/RT-Win32-Simulator/Makefile
+++ b/demos/various/RT-Win32-Simulator/Makefile
@@ -25,7 +25,7 @@ endif
 
 # Linker extra options here.
 ifeq ($(USE_LDOPT),)
-  USE_LDOPT = 
+  USE_LDOPT = --defsym=___main_thread_stack_base__=0,--defsym=___main_thread_stack_end__=0
 endif
 
 # Enable this if you want link time optimizations (LTO).
diff --git a/test/rt/testbuild/Makefile b/test/rt/testbuild/Makefile
index d22395733..d5b53dc12 100755
--- a/test/rt/testbuild/Makefile
+++ b/test/rt/testbuild/Makefile
@@ -25,7 +25,7 @@ endif
 
 # Linker extra options here.
 ifeq ($(USE_LDOPT),)
-  USE_LDOPT = 
+  USE_LDOPT = --defsym=__main_thread_stack_base__=0,--defsym=__main_thread_stack_end__=0
 endif
 
 # Enable this if you want link time optimizations (LTO).
diff --git a/test/rt/testbuild/Makefile_win32 b/test/rt/testbuild/Makefile_win32
index c935e9268..6933e0a98 100755
--- a/test/rt/testbuild/Makefile_win32
+++ b/test/rt/testbuild/Makefile_win32
@@ -25,7 +25,7 @@ endif
 
 # Linker extra options here.
 ifeq ($(USE_LDOPT),)
-  USE_LDOPT = 
+  USE_LDOPT = --defsym=___main_thread_stack_base__=0,--defsym=___main_thread_stack_end__=0
 endif
 
 # Enable this if you want link time optimizations (LTO).