diff --git a/build b/build
index fb2ecf8bb..bed17f407 100755
--- a/build
+++ b/build
@@ -74,27 +74,23 @@ relup_db() {
 make_relup() {
     local lib_dir="_build/$PROFILE/rel/emqx/lib"
     local releases_dir="_build/$PROFILE/rel/emqx/releases"
-    local name_pattern
+    local zip_file
     mkdir -p "$lib_dir" "$releases_dir" '_upgrade_base'
     local releases=()
     if [ -d "$releases_dir" ]; then
         for BASE_VSN in $(relup_db base-vsns "$PKG_VSN"); do
             OTP_BASE=$(relup_db otp-vsn-for "$PKG_VSN")
-            name_pattern="${PROFILE}-$(env OTP_VSN="$OTP_BASE" PKG_VSN="$BASE_VSN" ./scripts/pkg-full-vsn.sh 'vsn_exact')"
-            while read -r zip; do
-                local base_vsn
-                base_vsn="$(echo "$zip" | grep -oE "[0-9]+\.[0-9]+\.[0-9]+(-[0-9a-f]{8})?" | head -1)"
-                if [ ! -d "$releases_dir/$base_vsn" ]; then
-                    local tmp_dir
-                    tmp_dir="$(mktemp -d -t emqx.XXXXXXX)"
-                    unzip -q "$zip" "emqx/releases/*" -d "$tmp_dir"
-                    unzip -q "$zip" "emqx/lib/*" -d "$tmp_dir"
-                    cp -r -n "$tmp_dir/emqx/releases"/* "$releases_dir" || true
-                    cp -r -n "$tmp_dir/emqx/lib"/* "$lib_dir" || true
-                    rm -rf "$tmp_dir"
-                fi
-                releases+=( "$base_vsn" )
-            done < <("$FIND" _upgrade_base -maxdepth 1 -name "${name_pattern}.zip" -type f)
+            zip_file="_upgrade_base/${PROFILE}-$(env OTP_VSN="$OTP_BASE" PKG_VSN="$BASE_VSN" ./scripts/pkg-full-vsn.sh 'vsn_exact').zip"
+            if [ ! -d "$releases_dir/$BASE_VSN" ]; then
+                local tmp_dir
+                tmp_dir="$(mktemp -d -t emqx.XXXXXXX)"
+                unzip -q "$zip_file" "emqx/releases/*" -d "$tmp_dir"
+                unzip -q "$zip_file" "emqx/lib/*" -d "$tmp_dir"
+                cp -r -n "$tmp_dir/emqx/releases"/* "$releases_dir" || true
+                cp -r -n "$tmp_dir/emqx/lib"/* "$lib_dir" || true
+                rm -rf "$tmp_dir"
+            fi
+            releases+=( "$BASE_VSN" )
         done
     fi
     if [ ${#releases[@]} -eq 0 ]; then