diff --git a/arch/arm/src/armv7-m/arm_stackcheck.c b/arch/arm/src/armv7-m/arm_stackcheck.c
index 419d551d65..613c742df0 100644
--- a/arch/arm/src/armv7-m/arm_stackcheck.c
+++ b/arch/arm/src/armv7-m/arm_stackcheck.c
@@ -59,7 +59,7 @@ void __cyg_profile_func_enter(void *func, void *caller)
   __attribute__((naked, no_instrument_function));
 void __cyg_profile_func_exit(void *func, void *caller)
   __attribute__((naked, no_instrument_function));
-void  _stack_overflow_trap(void)
+void __stack_overflow_trap(void)
   __attribute__((naked, no_instrument_function));
 
 /****************************************************************************