diff --git a/gen_pack.sh b/gen_pack.sh
index 42daf14a..f8f24c5c 100755
--- a/gen_pack.sh
+++ b/gen_pack.sh
@@ -136,7 +136,7 @@ function postprocess() {
 # Set GEN_PACK_LIB_PATH to use a specific gen-pack library root
 # ... instead of bootstrap based on REQUIRED_GEN_PACK_LIB
 if [[ -f "${GEN_PACK_LIB_PATH}/gen-pack" ]]; then
-  . "${GEN_PACK_LIB}/gen-pack"
+  . "${GEN_PACK_LIB_PATH}/gen-pack"
 else
   . <(curl -sL "https://raw.githubusercontent.com/Open-CMSIS-Pack/gen-pack/main/bootstrap")
 fi