diff --git a/kdumpctl b/kdumpctl
index a8384c8..e670295 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -1606,15 +1606,19 @@ reset_crashkernel_after_update()
 #
 # The environment variable entries in /proc/[pid]/environ are separated
 # by null bytes instead of by spaces.
+#
+# $1: environment variable
+# $2: environ file path
 read_proc_environ_var()
 {
-	local _environ_path=$1 _var=$2
+	local _var=$1 _environ_path=$2
 	sed -n -E "s/.*(^|\x00)${_var}=([^\x00]*).*/\2/p" < "$_environ_path"
 }
 
+_OSBUILD_ENVIRON_PATH='/proc/1/environ'
 _is_osbuild()
 {
-	[[ $(read_proc_environ_var container /proc/1/environ) == bwrap-osbuild ]]
+	[[ $(read_proc_environ_var container "$_OSBUILD_ENVIRON_PATH") == bwrap-osbuild ]]
 }
 
 reset_crashkernel_for_installed_kernel()