diff --git a/lib/pg/connection.rb b/lib/pg/connection.rb
index cb9e64e16..a9052ce78 100644
--- a/lib/pg/connection.rb
+++ b/lib/pg/connection.rb
@@ -117,7 +117,7 @@ def inspect
 		return str
 	end
 
-	BinarySignature = "PGCOPY\n\377\r\n\0".b
+	BinarySignature = "PGCOPY\n\377\r\n\0"
 	private_constant :BinarySignature
 
 	#  call-seq:
diff --git a/spec/pg/basic_type_map_based_on_result_spec.rb b/spec/pg/basic_type_map_based_on_result_spec.rb
index 80d1535df..e8c26e2f6 100644
--- a/spec/pg/basic_type_map_based_on_result_spec.rb
+++ b/spec/pg/basic_type_map_based_on_result_spec.rb
@@ -29,7 +29,7 @@
 			Ractor.make_shareable(basic_type_mapping)
 		end
 
-		it "should be usable with Ractor", :ractor do
+		it "should be usable with Ractor in text format", :ractor do
 			vals = Ractor.new(@conninfo) do |conninfo|
 				conn = PG.connect(conninfo)
 				basic_type_mapping = PG::BasicTypeMapBasedOnResult.new(conn)
@@ -52,6 +52,29 @@
 			expect( vals ).to eq( [['b', '234', '{2,3}']] )
 		end
 
+		it "should be usable with Ractor in binary format", :ractor do
+			vals = Ractor.new(@conninfo) do |conninfo|
+				conn = PG.connect(conninfo)
+				basic_type_mapping = PG::BasicTypeMapBasedOnResult.new(conn)
+				conn.exec( "CREATE TEMP TABLE copytable (t TEXT, i INT)" )
+
+				# Retrieve table OIDs per empty result set.
+				res = conn.exec( "SELECT * FROM copytable LIMIT 0", [], 1)
+				tm = basic_type_mapping.build_column_map( res )
+				row_encoder = PG::BinaryEncoder::CopyRow.new type_map: tm
+
+				conn.copy_data( "COPY copytable FROM STDIN WITH (FORMAT binary)", row_encoder ) do |res|
+					conn.put_copy_data ['b', 234]
+				end
+				res = conn.exec( "SELECT * FROM copytable" )
+				res.values
+			ensure
+				conn&.finish
+			end.take
+
+			expect( vals ).to eq( [['b', '234']] )
+		end
+
 		context "with usage of result oids for bind params encoder selection" do
 			it "can type cast query params" do
 				@conn.exec( "CREATE TEMP TABLE copytable (t TEXT, i INT, ai INT[], by BYTEA)" )
diff --git a/spec/pg/connection_spec.rb b/spec/pg/connection_spec.rb
index a4bfd79ad..98af4160b 100644
--- a/spec/pg/connection_spec.rb
+++ b/spec/pg/connection_spec.rb
@@ -47,6 +47,16 @@
 		expect( vals ).to eq( [["123"]] )
 	end
 
+	it "connects using 7 arguments in a Ractor", :ractor do
+		vals = Ractor.new do
+			PG.connect( 'localhost', @port, nil, nil, :test, nil, nil ) do |conn|
+				conn.exec("SELECT 234").values
+			end
+		end.take
+
+		expect( vals ).to eq( [["234"]] )
+	end
+
 	describe "#inspect", :without_transaction do
 		it "should print host, port and user of a fresh connection, but not more" do
 			expect( @conn.inspect ).to match(/<PG::Connection:[0-9a-fx]+ host=localhost port=#{@port} user=\w*>/)