diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index d3e89a1..ccea737 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -221,10 +221,10 @@ spcd_openssl_x509() {
 # ╰───────────┴────╯
 
 spcd_os_grep() {
-    spcd_os_grep__variable="${1}"
-    [ -n "${spcd_os_grep__variable}" ] &&
-        grep "^${spcd_os_grep__variable}=" "/etc/os-release" |
-        sed "s|^${spcd_os_grep__variable}=||" |
+    local variable="${1}"
+    [ -n "${variable}" ] &&
+        grep "^${variable}=" "/etc/os-release" |
+        sed "s|^${variable}=||" |
             sed "s|^\"\(.*\)\"$|\1|"
 }