jruby
diff --git a/‎core/src/main/java/org/jruby/RubyString.java‎
Lines changed: 5 additions & 0 deletions b/‎core/src/main/java/org/jruby/RubyString.java‎
Lines changed: 5 additions & 0 deletions
@@ -6026,6 +6026,11 @@ public RubyArray unpack(ThreadContext context, IRubyObject obj, Block block) {
         return Pack.unpackWithBlock(context, this, stringValue(obj).value, block);
     }
 
+    @JRubyMethod
+    public IRubyObject unpack1(ThreadContext context, IRubyObject obj, Block block) {
+        return Pack.unpack1WithBlock(context, this, stringValue(obj).value, block);
+    }
+
     @Deprecated // not used
     public RubyArray unpack(IRubyObject obj) {
         return Pack.unpack(getRuntime(), this.value, stringValue(obj).value);