diff --git a/dev/root-meson.build b/dev/root-meson.build
index a3034a21..6f38254f 100644
--- a/dev/root-meson.build
+++ b/dev/root-meson.build
@@ -1,5 +1,5 @@
 project('raysect', 'cython',
-    default_options: ['python.install-env=auto'],
+    default_options: ['python.install_env=auto'],
     version: run_command(['dev/build/update_version.sh'], check: true).stdout().strip()
 )
 
diff --git a/meson.build b/meson.build
index 62bcf36f..0a8c31e8 100644
--- a/meson.build
+++ b/meson.build
@@ -2,7 +2,7 @@
 # The template file used to generate this file is dev/root-meson.build.
 
 project('raysect', 'cython',
-    default_options: ['python.install-env=auto'],
+    default_options: ['python.install_env=auto'],
     version: run_command(['dev/build/update_version.sh'], check: true).stdout().strip()
 )