diff --git a/gen_package.sh b/gen_package.sh
index 1970a85..9f88278 100755
--- a/gen_package.sh
+++ b/gen_package.sh
@@ -155,7 +155,7 @@ gen_kerncache_extract_config()
 gen_kerncache_is_valid()
 {
     KERNCACHE_IS_VALID=0
-    if [ "${NO_KERNEL_SOURCES}" = '1' ]
+    if [ "${KERNEL_SOURCES}" = '0' ]
     then
 
         BUILD_KERNEL=0