diff --git a/ext/openssl/lib/openssl/ssl.rb b/ext/openssl/lib/openssl/ssl.rb
index a628648e71..fb143c9408 100644
--- a/ext/openssl/lib/openssl/ssl.rb
+++ b/ext/openssl/lib/openssl/ssl.rb
@@ -201,7 +201,7 @@ YoaOffgTf5qxiwkjnlVZQc3whgnEt9FpVMvQ9eknyeGB5KHfayAc3+hUAvI3/Cr3
         if /(?<type>_client|_server)\z/ =~ meth
           meth = $`
           if $VERBOSE
-            warn "#{caller(1)[0]}: method type #{type.inspect} is ignored"
+            warn "#{caller(1, 1)[0]}: method type #{type.inspect} is ignored"
           end
         end
         version = METHODS_MAP[meth.intern] or
diff --git a/lib/delegate.rb b/lib/delegate.rb
index c5a94a5d31..71aff40f7f 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -97,7 +97,7 @@ class Delegator < BasicObject
     target = self.__getobj__ {r = false}
     r &&= target.respond_to?(m, include_private)
     if r && include_private && !target.respond_to?(m, false)
-      warn "#{caller(3)[0]}: delegator does not forward private method \##{m}"
+      warn "#{caller(3, 1)[0]}: delegator does not forward private method \##{m}"
       return false
     end
     r
diff --git a/lib/ipaddr.rb b/lib/ipaddr.rb
index ecf28ebb25..0f3a5e2878 100644
--- a/lib/ipaddr.rb
+++ b/lib/ipaddr.rb
@@ -310,7 +310,7 @@ class IPAddr
 
   # Returns true if the ipaddr is an IPv4-compatible IPv6 address.
   def ipv4_compat?
-    warn "#{caller(1)[0]}: warning: IPAddr\##{__callee__} is obsolete" if $VERBOSE
+    warn "#{caller(1, 1)[0]}: warning: IPAddr\##{__callee__} is obsolete" if $VERBOSE
     _ipv4_compat?
   end
 
@@ -336,7 +336,7 @@ class IPAddr
   # Returns a new ipaddr built by converting the native IPv4 address
   # into an IPv4-compatible IPv6 address.
   def ipv4_compat
-    warn "#{caller(1)[0]}: warning: IPAddr\##{__callee__} is obsolete" if $VERBOSE
+    warn "#{caller(1, 1)[0]}: warning: IPAddr\##{__callee__} is obsolete" if $VERBOSE
     if !ipv4?
       raise InvalidAddressError, "not an IPv4 address"
     end
diff --git a/lib/matrix.rb b/lib/matrix.rb
index 77c35b3475..3a049dda9f 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1246,7 +1246,7 @@ class Matrix
   # deprecated; use Matrix#determinant
   #
   def determinant_e
-    warn "#{caller(1)[0]}: warning: Matrix#determinant_e is deprecated; use #determinant"
+    warn "#{caller(1, 1)[0]}: warning: Matrix#determinant_e is deprecated; use #determinant"
     determinant
   end
   alias det_e determinant_e
@@ -1304,7 +1304,7 @@ class Matrix
   # deprecated; use Matrix#rank
   #
   def rank_e
-    warn "#{caller(1)[0]}: warning: Matrix#rank_e is deprecated; use #rank"
+    warn "#{caller(1, 1)[0]}: warning: Matrix#rank_e is deprecated; use #rank"
     rank
   end
 
@@ -1490,17 +1490,17 @@ class Matrix
   end
 
   def elements_to_f
-    warn "#{caller(1)[0]}: warning: Matrix#elements_to_f is deprecated, use map(&:to_f)"
+    warn "#{caller(1, 1)[0]}: warning: Matrix#elements_to_f is deprecated, use map(&:to_f)"
     map(&:to_f)
   end
 
   def elements_to_i
-    warn "#{caller(1)[0]}: warning: Matrix#elements_to_i is deprecated, use map(&:to_i)"
+    warn "#{caller(1, 1)[0]}: warning: Matrix#elements_to_i is deprecated, use map(&:to_i)"
     map(&:to_i)
   end
 
   def elements_to_r
-    warn "#{caller(1)[0]}: warning: Matrix#elements_to_r is deprecated, use map(&:to_r)"
+    warn "#{caller(1, 1)[0]}: warning: Matrix#elements_to_r is deprecated, use map(&:to_r)"
     map(&:to_r)
   end
 
@@ -2142,17 +2142,17 @@ class Vector
   end
 
   def elements_to_f
-    warn "#{caller(1)[0]}: warning: Vector#elements_to_f is deprecated"
+    warn "#{caller(1, 1)[0]}: warning: Vector#elements_to_f is deprecated"
     map(&:to_f)
   end
 
   def elements_to_i
-    warn "#{caller(1)[0]}: warning: Vector#elements_to_i is deprecated"
+    warn "#{caller(1, 1)[0]}: warning: Vector#elements_to_i is deprecated"
     map(&:to_i)
   end
 
   def elements_to_r
-    warn "#{caller(1)[0]}: warning: Vector#elements_to_r is deprecated"
+    warn "#{caller(1, 1)[0]}: warning: Vector#elements_to_r is deprecated"
     map(&:to_r)
   end
 
diff --git a/lib/net/http/response.rb b/lib/net/http/response.rb
index 1351d7b2d2..ee02f4be4a 100644
--- a/lib/net/http/response.rb
+++ b/lib/net/http/response.rb
@@ -140,17 +140,17 @@ class Net::HTTPResponse
   #
 
   def response   #:nodoc:
-    warn "#{caller(1)[0]}: warning: Net::HTTPResponse#response is obsolete" if $VERBOSE
+    warn "#{caller(1, 1)[0]}: warning: Net::HTTPResponse#response is obsolete" if $VERBOSE
     self
   end
 
   def header   #:nodoc:
-    warn "#{caller(1)[0]}: warning: Net::HTTPResponse#header is obsolete" if $VERBOSE
+    warn "#{caller(1, 1)[0]}: warning: Net::HTTPResponse#header is obsolete" if $VERBOSE
     self
   end
 
   def read_header   #:nodoc:
-    warn "#{caller(1)[0]}: warning: Net::HTTPResponse#read_header is obsolete" if $VERBOSE
+    warn "#{caller(1, 1)[0]}: warning: Net::HTTPResponse#read_header is obsolete" if $VERBOSE
     self
   end
 
diff --git a/lib/uri/common.rb b/lib/uri/common.rb
index 74bbdea0a4..a082c2a918 100644
--- a/lib/uri/common.rb
+++ b/lib/uri/common.rb
@@ -100,7 +100,7 @@ module URI
     #   # => "@%3F@%21"
     #
     def escape(*arg)
-      warn "#{caller(1)[0]}: warning: URI.escape is obsolete" if $VERBOSE
+      warn "#{caller(1, 1)[0]}: warning: URI.escape is obsolete" if $VERBOSE
       DEFAULT_PARSER.escape(*arg)
     end
     alias encode escape
@@ -132,7 +132,7 @@ module URI
     #   # => "http://example.com/?a=\t\r"
     #
     def unescape(*arg)
-      warn "#{caller(1)[0]}: warning: URI.unescape is obsolete" if $VERBOSE
+      warn "#{caller(1, 1)[0]}: warning: URI.unescape is obsolete" if $VERBOSE
       DEFAULT_PARSER.unescape(*arg)
     end
     alias decode unescape
@@ -300,7 +300,7 @@ module URI
   #   # => ["http://foo.example.com/bla", "mailto:test@example.com"]
   #
   def self.extract(str, schemes = nil, &block)
-    warn "#{caller(1)[0]}: warning: URI.extract is obsolete" if $VERBOSE
+    warn "#{caller(1, 1)[0]}: warning: URI.extract is obsolete" if $VERBOSE
     DEFAULT_PARSER.extract(str, schemes, &block)
   end
 
@@ -336,7 +336,7 @@ module URI
   #   end
   #
   def self.regexp(schemes = nil)
-    warn "#{caller(1)[0]}: warning: URI.regexp is obsolete" if $VERBOSE
+    warn "#{caller(1, 1)[0]}: warning: URI.regexp is obsolete" if $VERBOSE
     DEFAULT_PARSER.make_regexp(schemes)
   end
 
diff --git a/test/lib/test/unit.rb b/test/lib/test/unit.rb
index afdd5de00b..761fe92df8 100644
--- a/test/lib/test/unit.rb
+++ b/test/lib/test/unit.rb
@@ -842,7 +842,7 @@ module Test
         begin
           require "rbconfig"
         rescue LoadError
-          warn "#{caller(1)[0]}: warning: Parallel running disabled because can't get path to ruby; run specify with --ruby argument"
+          warn "#{caller(1, 1)[0]}: warning: Parallel running disabled because can't get path to ruby; run specify with --ruby argument"
           options[:parallel] = nil
         else
           options[:ruby] ||= [RbConfig.ruby]