diff --git a/images/linux/post-generation/homebrew-permissions.sh b/images/linux/post-generation/homebrew-permissions.sh
index 1dbd043e..edd15fb7 100644
--- a/images/linux/post-generation/homebrew-permissions.sh
+++ b/images/linux/post-generation/homebrew-permissions.sh
@@ -2,10 +2,13 @@
 
 # Fix permissions for Homebrew
 # https://github.com/actions/virtual-environments/issues/1568
+
 brew_folder="/home/linuxbrew/"
+homebrew_user=$(cut -d: -f1 /etc/passwd | tail -1)
+
 if [ -d "$brew_folder" ]; then
     brew_folder_owner=$(ls -ld $brew_folder | awk '{print $3}')
-    if [ "$USER" != "$brew_folder_owner" ]; then
-        chown "$USER":docker -R $brew_folder
+    if [ "$homebrew_user" != "$brew_folder_owner" ]; then
+        chown "$homebrew_user":docker -R $brew_folder
     fi
 fi
diff --git a/images/linux/post-generation/rust-permissions.sh b/images/linux/post-generation/rust-permissions.sh
index 6673686b..aff56ca1 100644
--- a/images/linux/post-generation/rust-permissions.sh
+++ b/images/linux/post-generation/rust-permissions.sh
@@ -2,10 +2,13 @@
 
 # Fix permissions for the Rust folder
 # https://github.com/actions/virtual-environments/issues/572
+
 rust_folder="/usr/share/rust"
+rust_user=$(cut -d: -f1 /etc/passwd | tail -1)
+
 if [ -d "$rust_folder" ]; then
     rust_folder_owner=$(ls -ld $rust_folder | awk '{print $3}')
-    if [ "$USER" != "$rust_folder_owner" ]; then
-        chown "$USER":docker -R $rust_folder
+    if [ "$rust_user" != "$rust_folder_owner" ]; then
+        chown "$rust_user":docker -R $rust_folder
     fi
 fi