diff --git a/pkgs/compiler-lib/compiler/zo-marshal.rkt b/pkgs/compiler-lib/compiler/zo-marshal.rkt
index 8b17d1178c..38371c54a1 100644
--- a/pkgs/compiler-lib/compiler/zo-marshal.rkt
+++ b/pkgs/compiler-lib/compiler/zo-marshal.rkt
@@ -344,7 +344,7 @@
 (define CPT_SMALL_MARSHALLED_START 80)
 (define CPT_SMALL_MARSHALLED_END 92)
 
-(define CPT_SMALL_LIST_MAX 65)
+(define CPT_SMALL_LIST_MAX 50)
 (define CPT_SMALL_PROPER_LIST_START 92)
 (define CPT_SMALL_PROPER_LIST_END (+ CPT_SMALL_PROPER_LIST_START CPT_SMALL_LIST_MAX))