diff --git a/zo-lib/compiler/zo-marshal.rkt b/zo-lib/compiler/zo-marshal.rkt
index de99445d5d..13ed9bc42e 100644
--- a/zo-lib/compiler/zo-marshal.rkt
+++ b/zo-lib/compiler/zo-marshal.rkt
@@ -288,7 +288,7 @@
 (define module-type-num 26)
 (define inline-variants-type-num 27)
 (define variable-type-num 35)
-(define prefix-type-num 115)
+(define prefix-type-num 120)
 
 (define-syntax define-enum
   (syntax-rules ()
diff --git a/zo-lib/compiler/zo-parse.rkt b/zo-lib/compiler/zo-parse.rkt
index 1788f7153b..aec5c78cd1 100644
--- a/zo-lib/compiler/zo-parse.rkt
+++ b/zo-lib/compiler/zo-parse.rkt
@@ -395,7 +395,7 @@
     [(27) 'inline-variant-type]
     [(35) 'variable-type]
     [(36) 'module-variable-type]
-    [(115) 'resolve-prefix-type]
+    [(120) 'resolve-prefix-type]
     [else (error 'int->type "unknown type: ~e" i)]))
 
 (define type-readers