diff --git a/src/vmsrc/apple/sossys.pla b/src/vmsrc/apple/sossys.pla
index 077efc6..3042737 100755
--- a/src/vmsrc/apple/sossys.pla
+++ b/src/vmsrc/apple/sossys.pla
@@ -28,6 +28,12 @@ struc t_defentry
     byte bytecodesize
 end
 //
+// JIT compiler values
+//
+const jitcomp     = $B7F0
+const jitcodeptr  = $B7F2
+const codemax     = $A000
+//
 // Pedefined functions.
 //
 predef syscall(cmd,params)#1, call(addr,areg,xreg,yreg,status)#1
@@ -1270,16 +1276,18 @@ def loadmod(mod)#1
 end
 def execmod(modfile)#1
     byte moddci[17]
-    word saveheap, savesym, saveflags
+    word saveheap, savesym, saveflags, savejit
 
     perr = 1
     if stodci(modfile, @moddci)
-        saveheap    = heap
-        savesym     = lastsym
-        saveflags   = systemflags
+        saveheap  = heap
+        savesym   = lastsym
+        saveflags = systemflags
+        savejit   = *jitcodeptr
         if loadmod(@moddci) < modkeep
-            lastsym = savesym
-            heap    = saveheap
+            lastsym     = savesym
+            heap        = saveheap
+            *jitcodeptr = savejit
             while modid
                 modid--
                 seg_release(modseg[modid])