diff --git a/env.ps1 b/env.ps1
index 2de6034..3614196 100644
--- a/env.ps1
+++ b/env.ps1
@@ -34,6 +34,7 @@
 # failed. This makes it infeasible to do proper error checking.
 # See https://github.com/PowerShell/PowerShell/issues/12218
 
+Function Global:resetenv { rm -r venv; .\env.ps1 }
 Function Global:dotidy { black src tests build.py }
 Function Global:dolint { flake8 src tests build.py }
 Function Global:dotest { pytest -q -n auto -x -l --sw --hypothesis-profile=dev $args }
diff --git a/env.sh b/env.sh
index c740c7d..1b4c93e 100644
--- a/env.sh
+++ b/env.sh
@@ -25,6 +25,7 @@
 
 unset -f activate die setup
 
+resetenv() { rm -r venv; . ./env.sh; }
 dotidy() { black src tests build.py; }
 dolint() { flake8 src tests build.py; }
 dotest() { pytest -q -n auto -x -l --sw --hypothesis-profile=dev $@; }