diff --git a/docs/shared-paths.md b/docs/shared-paths.md
index a4bfae1cf279a8b56f5f960f99d87efb3c5a747b..75ab290c6eb32f583b1906ea67a19499524f75ff 100644
--- a/docs/shared-paths.md
+++ b/docs/shared-paths.md
@@ -230,6 +230,7 @@ the container:
     * `/boot`
     * `/root`
 * `$STEAM_RUNTIME`
+* `$STEAM_RUNTIME_SCOUT`
 
 ## The home directory
 
diff --git a/pressure-vessel/wrap-setup.c b/pressure-vessel/wrap-setup.c
index 8bac27bd7a4f445a2997de30f50b7fa90ab25ae0..2dc46ccf31c086dfbd6a450c19265a8ed4e3054c 100644
--- a/pressure-vessel/wrap-setup.c
+++ b/pressure-vessel/wrap-setup.c
@@ -1154,6 +1154,7 @@ static const EnvMount known_required_env[] =
     { "STEAM_COMPAT_TOOL_PATH", ENV_MOUNT_FLAGS_DEPRECATED },
     { "STEAM_COMPAT_TOOL_PATHS", ENV_MOUNT_FLAGS_COLON_DELIMITED },
     { "STEAM_EXTRA_COMPAT_TOOLS_PATHS", ENV_MOUNT_FLAGS_COLON_DELIMITED },
+    { "STEAM_RUNTIME_SCOUT", ENV_MOUNT_FLAGS_NONE },
     { "XDG_CACHE_HOME", ENV_MOUNT_FLAGS_IF_HOME_SHARED },
     { "XDG_CONFIG_HOME", ENV_MOUNT_FLAGS_IF_HOME_SHARED },
     { "XDG_DATA_HOME", ENV_MOUNT_FLAGS_IF_HOME_SHARED },