diff --git a/src/start.S b/src/start.S
index 14782b964..627657f8c 100644
--- a/src/start.S
+++ b/src/start.S
@@ -128,6 +128,17 @@ _begin:
 #endif	
 	msr	CPSR_c, #(SYS_MODE)
 
+	/* Clear BSS */
+clear_bss:
+	ldr     r0, _bss_start          /* find start of bss segment        */
+	ldr     r1, _bss_end            /* stop here                        */
+	mov     r2, #0x00000000         /* clear                            */
+clbss_l:
+	str    	r2, [r0]        	/* clear loop...                    */
+	add     r0, r0, #4
+	cmp     r0, r1
+	blt     clbss_l
+
 	b main
 
 //	ldr     r1,=_system_stack