diff --git a/src/kernel/cstartup.s b/src/kernel/cstartup.s
index 1200383..ebe3dd2 100755
--- a/src/kernel/cstartup.s
+++ b/src/kernel/cstartup.s
@@ -32,8 +32,9 @@
 
               .section code, noreorder
               .pubweak __program_root_section
-			  
+
 __program_root_section:
+			  wdm 	  #0x80
               clc
               xce                   ; native 16-bit mode
               rep     #0x38         ; 16-bit registers, no decimal mode
@@ -89,6 +90,8 @@ __call_heap_initialize:
               ldx     ##.word2 (.sectionSize heap)
               lda     ##.word0 (.sectionSize heap)
               jsl     long:__heap_initialize
+			  
+			  wdm 	  #0x81
 
               .section code, root, noreorder
               lda     ##0           ; argc = 0