diff --git a/src/main/java/com/sparrowwallet/drongo/OutputDescriptor.java b/src/main/java/com/sparrowwallet/drongo/OutputDescriptor.java
index 188341b..2bdf266 100644
--- a/src/main/java/com/sparrowwallet/drongo/OutputDescriptor.java
+++ b/src/main/java/com/sparrowwallet/drongo/OutputDescriptor.java
@@ -24,7 +24,7 @@ public class OutputDescriptor {
 
     private static final Pattern XPUB_PATTERN = Pattern.compile("(\\[[^\\]]+\\])?(.(?:pub|prv)[^/\\,)]{100,112})(/[/\\d*'hH<>;]+)?");
     private static final Pattern PUBKEY_PATTERN = Pattern.compile("(\\[[^\\]]+\\])?(0[23][0-9a-fA-F]{32})");
-    private static final Pattern MULTI_PATTERN = Pattern.compile("multi\\(([\\d+])");
+    private static final Pattern MULTI_PATTERN = Pattern.compile("multi\\((\\d+)");
     private static final Pattern KEY_ORIGIN_PATTERN = Pattern.compile("\\[([A-Fa-f0-9]{8})?([/\\d'hH]+)\\]");
     private static final Pattern MULTIPATH_PATTERN = Pattern.compile("<([\\d*'hH;]+)>");
     private static final Pattern CHECKSUM_PATTERN = Pattern.compile("#([" + CHECKSUM_CHARSET + "]{8})$");