diff --git a/build_library/catalyst.sh b/build_library/catalyst.sh
index 43626bcf43..db5159f40e 100644
--- a/build_library/catalyst.sh
+++ b/build_library/catalyst.sh
@@ -157,6 +157,8 @@ catalyst_init() {
     switch_to_strict_mode
     eval set -- "${FLAGS_ARGV}"
 
+    local stage
+
     if [[ -n "${FORCE_STAGES}" ]]; then
         STAGES="${FORCE_STAGES}"
     elif [[ $# -eq 0 ]]; then
@@ -248,6 +250,8 @@ write_configs() {
 }
 
 build_stage() {
+    local stage srcpath catalyst_conf target_tarball
+
     stage="$1"
     srcpath="$2"
     catalyst_conf="$3"
@@ -299,6 +303,8 @@ catalyst_build() {
     write_configs
     build_snapshot
 
+    local used_seed
+
     used_seed=0
     if [[ "$STAGES" =~ stage1 ]]; then
         build_stage stage1 "$SEED"