diff --git a/parser-tools/cfg-parser.rkt b/parser-tools/cfg-parser.rkt
index d76f960..227c8e0 100644
--- a/parser-tools/cfg-parser.rkt
+++ b/parser-tools/cfg-parser.rkt
@@ -32,7 +32,8 @@
 
 
 (require yaragg/parser-tools/yacc
-         yaragg/parser-tools/lex)
+         yaragg/parser-tools/lex
+         racket/list)
 
 (require (for-syntax racket/base
                      syntax/boundmap
diff --git a/parser-tools/private-lex/deriv.rkt b/parser-tools/private-lex/deriv.rkt
index ccac96b..d3f014a 100644
--- a/parser-tools/private-lex/deriv.rkt
+++ b/parser-tools/private-lex/deriv.rkt
@@ -1,5 +1,6 @@
 #lang racket/base
 (require (prefix-in is: data/integer-set)
+         racket/list
          yaragg/parser-tools/private-lex/re
          yaragg/parser-tools/private-lex/util)
 
diff --git a/parser-tools/private-yacc/lalr.rkt b/parser-tools/private-yacc/lalr.rkt
index 7b48cb6..99a221c 100644
--- a/parser-tools/private-yacc/lalr.rkt
+++ b/parser-tools/private-yacc/lalr.rkt
@@ -1,7 +1,8 @@
 #lang racket/base
 (require yaragg/parser-tools/private-yacc/lr0
          yaragg/parser-tools/private-yacc/grammar
-         racket/class)
+         racket/class
+         racket/list)
 
 ;; Compute LALR lookaheads from DeRemer and Pennello 1982