diff --git a/api/lib/opentelemetry/trace/tracer.rb b/api/lib/opentelemetry/trace/tracer.rb
index 3545c432fe..dc79629f73 100644
--- a/api/lib/opentelemetry/trace/tracer.rb
+++ b/api/lib/opentelemetry/trace/tracer.rb
@@ -31,7 +31,7 @@ class Tracer
       #
       # @yield [span, context] yields the newly created span and a context containing the
       #   span to the block.
-      def in_span(name, attributes: nil, links: nil, start_timestamp: nil, kind: nil, &block)
+      def in_span(name, attributes: nil, links: nil, start_timestamp: nil, kind: nil)
         span = nil
         span = start_span(name, attributes: attributes, links: links, start_timestamp: start_timestamp, kind: kind)
         Trace.with_span(span) { |s, c| yield s, c }