diff --git a/env.ps1 b/env.ps1
index d1ea597..1e4b87b 100644
--- a/env.ps1
+++ b/env.ps1
@@ -36,7 +36,7 @@
 Function Global:dotest_ci { pytest -q -n auto --hypothesis-profile=ci }
 Function Global:dotest_long { pytest -q -n 4 --hypothesis-profile=long }
 Function Global:docheck { dotidy && dolint && dotest }
-Function Global:_envps1_domut { mutmut run --paths-to-mutate "src/syntax.py src/tokenize.py src/parse.py" $args }
+Function Global:_envps1_domut { mutmut run --paths-to-mutate "src/token.py src/tokenize.py src/parse.py" $args }
 Function Global:domut { _envps1_domut }
 Function Global:domut_ci { _envps1_domut --no-progress | Select-String -Not "Running\.\.\.$" }
 Function Global:dobuild { python build.py }
diff --git a/env.sh b/env.sh
index 3b3b591..63bbd6f 100644
--- a/env.sh
+++ b/env.sh
@@ -32,7 +32,7 @@
 dotest_ci() { pytest -q -n auto --hypothesis-profile=ci; }
 dotest_long() { pytest -q -n 4 --hypothesis-profile=long; }
 docheck() { dotidy && dolint && dotest; }
-_envsh_domut() { mutmut run --paths-to-mutate "src/syntax.py src/tokenize.py src/parse.py" $@; }
+_envsh_domut() { mutmut run --paths-to-mutate "src/token.py src/tokenize.py src/parse.py" $@; }
 domut() { _envsh_domut; }
 domut_ci() { _envsh_domut --no-progress | grep -v "Running\.\.\.$"; }
 dobuild() { python build.py; }