diff --git a/src/toolsrc/codegen.pla b/src/toolsrc/codegen.pla
index 0f5e7e3..cc43eb5 100644
--- a/src/toolsrc/codegen.pla
+++ b/src/toolsrc/codegen.pla
@@ -481,10 +481,10 @@ def init_idglobal#0
     fixup_num   = FIXUPNUM
     globalbufsz = IDGLOBALSZ
     localbufsz  = IDLOCALSZ
-    if isult(heapavail, $4000)
+    if isult(heapavail, $8000)
         tag_num     = TAGNUM/2
         fixup_num   = FIXUPNUM/2
-        globalbufsz = IDGLOBALSZ/4
+        globalbufsz = IDGLOBALSZ/2
         localbufsz  = IDLOCALSZ/2
     fin
     tag_addr     = heapalloc(tag_num*2)