diff --git a/lib/snmp/manager.rb b/lib/snmp/manager.rb
index efcabef..1e070d5 100644
--- a/lib/snmp/manager.rb
+++ b/lib/snmp/manager.rb
@@ -537,7 +537,7 @@ def send(data, host, port)
 
     def recvfrom(max_bytes)
       data, host_info = @socket.recvfrom(max_bytes)
-      flags, host_port, host_name, host_ip = host_info
+      _, host_port, _, host_ip = host_info
       return data, host_ip, host_port
     end
   end
diff --git a/test/test_ber.rb b/test/test_ber.rb
index 360c3db..cd06b9b 100644
--- a/test/test_ber.rb
+++ b/test/test_ber.rb
@@ -118,7 +118,7 @@ def test_decode_timeticks
 
   # Decode ASN.1 octet string
   def test_decode_octet_string
-    s, data = decode_octet_string("\004\202\000\005hello")
+    s, _ = decode_octet_string("\004\202\000\005hello")
     assert_equal("hello",s)
     assert_raise(InvalidTag) {
       decode_octet_string("\005\202\000\005hello")
@@ -126,7 +126,7 @@ def test_decode_octet_string
   end
 
   def test_decode_ip_address
-    ip, data = decode_ip_address("@\004\001\002\003\004")
+    ip, _ = decode_ip_address("@\004\001\002\003\004")
     assert_equal(ip, "\001\002\003\004")
     assert_raise(InvalidTag) {
       decode_ip_address("\004\004\001\002\003\004")
diff --git a/test/test_pdu.rb b/test/test_pdu.rb
index c4eaf51..5f4102d 100644
--- a/test/test_pdu.rb
+++ b/test/test_pdu.rb
@@ -28,7 +28,7 @@ def test_message_decode_v2c
 
   def test_message_decoder_v3
     assert_raise(SNMP::UnsupportedVersion) do
-      message = SNMP::Message.decode("0>\002\001\0030\021\002\004&\266\342\314\002\003\000\377\343\004\001\004\002\001\003\004\0200\016\004\000\002\001\000\002\001\000\004\000\004\000\004\0000\024\004\000\004\000\240\016\002\004\v\3623\233\002\001\000\002\001\0000\000")
+      SNMP::Message.decode("0>\002\001\0030\021\002\004&\266\342\314\002\003\000\377\343\004\001\004\002\001\003\004\0200\016\004\000\002\001\000\002\001\000\004\000\004\000\004\0000\024\004\000\004\000\240\016\002\004\v\3623\233\002\001\000\002\001\0000\000")
     end
   end
 
diff --git a/test/test_retry.rb b/test/test_retry.rb
index a998580..14fe345 100644
--- a/test/test_retry.rb
+++ b/test/test_retry.rb
@@ -40,10 +40,10 @@ def close
 
   def send(data, host, port)
     bad_id_data = data.dup
-    bad_msg = SNMP::Message.decode(data)
+    bad_msg = SNMP::Message.decode(bad_id_data)
     bad_msg.pdu.request_id -= 3  # corrupt request_id
     @data << bad_msg.encode # insert corrupted PDU before real data
-    @data << data
+    @data << bad_id_data
   end
 
   def recv(max_bytes)