diff --git a/dracut-functions.sh b/dracut-functions.sh
index e5e6884b..be287c39 100755
--- a/dracut-functions.sh
+++ b/dracut-functions.sh
@@ -668,7 +668,7 @@ check_kernel_config()
     # no kernel config file, so return true
     [[ $_config_file ]] || return 0
 
-    grep -q -F "${_config_opt}=" "$_config_file" && return 0
+    grep -q -F "${_config_opt}=" "$dracutsysrootdir$_config_file" && return 0
     return 1
 }