diff --git a/libguile/vm-i-system.c b/libguile/vm-i-system.c
index 474fe78..a47ac38 100644
--- a/libguile/vm-i-system.c
+++ b/libguile/vm-i-system.c
@@ -55,6 +55,7 @@ VM_DEFINE_INSTRUCTION (1, halt, "halt", 0, 0, 0)
        stack */
     ip = SCM_FRAME_RETURN_ADDRESS (fp);
     fp = SCM_FRAME_DYNAMIC_LINK (fp);
+    asm volatile ("");
     NULLSTACK (old_sp - sp);
   }
   
@@ -1267,6 +1268,7 @@ VM_DEFINE_INSTRUCTION (67, return, "return", 0, 1, 1)
     sp = SCM_FRAME_LOWER_ADDRESS (fp);
     ip = SCM_FRAME_RETURN_ADDRESS (fp);
     fp = SCM_FRAME_DYNAMIC_LINK (fp);
+    asm volatile ("");
 
 #ifdef VM_ENABLE_STACK_NULLING
     NULLSTACK (old_sp - sp);
@@ -1302,6 +1304,7 @@ VM_DEFINE_INSTRUCTION (68, return_values, "return/values", 1, -1, -1)
       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
       ip = SCM_FRAME_MV_RETURN_ADDRESS (fp);
       fp = SCM_FRAME_DYNAMIC_LINK (fp);
+      asm volatile ("");
         
       /* Push return values, and the number of values */
       for (i = 0; i < nvalues; i++)
@@ -1322,6 +1325,7 @@ VM_DEFINE_INSTRUCTION (68, return_values, "return/values", 1, -1, -1)
       sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
       ip = SCM_FRAME_RETURN_ADDRESS (fp);
       fp = SCM_FRAME_DYNAMIC_LINK (fp);
+      asm volatile ("");
         
       /* Push first value */
       *++sp = vals[1];