diff --git a/lib/rscons.rb b/lib/rscons.rb
index 067bd23..bf8a58a 100644
--- a/lib/rscons.rb
+++ b/lib/rscons.rb
@@ -66,19 +66,6 @@ module Rscons
       application.vars(*args)
     end
 
-    # Return whether the given path is an absolute filesystem path.
-    #
-    # @param path [String] the path to examine.
-    #
-    # @return [Boolean] Whether the given path is an absolute filesystem path.
-    def absolute_path?(path)
-      if RUBY_PLATFORM =~ /mingw/
-        path =~ %r{^(?:\w:)?[\\/]}
-      else
-        path.start_with?("/")
-      end
-    end
-
     # Return whether the given target is a phony target.
     #
     # @param target [Symbol, String] Target name.
diff --git a/lib/rscons/util.rb b/lib/rscons/util.rb
index f8f92cf..a5c4762 100644
--- a/lib/rscons/util.rb
+++ b/lib/rscons/util.rb
@@ -2,6 +2,19 @@ module Rscons
   module Util
     class << self
 
+      # Return whether the given path is an absolute filesystem path.
+      #
+      # @param path [String] the path to examine.
+      #
+      # @return [Boolean] Whether the given path is an absolute filesystem path.
+      def absolute_path?(path)
+        if RUBY_PLATFORM =~ /mingw/
+          path =~ %r{^(?:\w:)?[\\/]}
+        else
+          path.start_with?("/")
+        end
+      end
+
       # Make a relative path corresponding to a possibly absolute one.
       #
       # @param path [String]
@@ -10,7 +23,7 @@ module Rscons
       # @return [String]
       #   Relative path.
       def make_relative_path(path)
-        if Rscons.absolute_path?(path)
+        if absolute_path?(path)
           if path =~ %r{^(\w):(.*)$}
             "_#{$1}#{$2}"
           else
diff --git a/spec/rscons/util_spec.rb b/spec/rscons/util_spec.rb
index dc1190b..04495a0 100644
--- a/spec/rscons/util_spec.rb
+++ b/spec/rscons/util_spec.rb
@@ -1,6 +1,34 @@
 module Rscons
   describe Util do
 
+    describe ".absolute_path?" do
+      context "on Windows" do
+        it "returns whether a path is absolute" do
+          stub_const("RUBY_PLATFORM", "mingw")
+          expect(Util.absolute_path?("/foo")).to be_truthy
+          expect(Util.absolute_path?("\\Windows")).to be_truthy
+          expect(Util.absolute_path?("C:\\Windows")).to be_truthy
+          expect(Util.absolute_path?("f:\\stuff")).to be_truthy
+          expect(Util.absolute_path?("g:/projects")).to be_truthy
+          expect(Util.absolute_path?("x:foo")).to be_falsey
+          expect(Util.absolute_path?("file.txt")).to be_falsey
+        end
+      end
+
+      context "on non-Windows" do
+        it "returns whether a path is absolute" do
+          stub_const("RUBY_PLATFORM", "linux")
+          expect(Util.absolute_path?("/foo")).to be_truthy
+          expect(Util.absolute_path?("\\Windows")).to be_falsey
+          expect(Util.absolute_path?("C:\\Windows")).to be_falsey
+          expect(Util.absolute_path?("f:\\stuff")).to be_falsey
+          expect(Util.absolute_path?("g:/projects")).to be_falsey
+          expect(Util.absolute_path?("x:foo")).to be_falsey
+          expect(Util.absolute_path?("file.txt")).to be_falsey
+        end
+      end
+    end
+
     describe ".make_relative_path" do
       context "when passed a relative path" do
         it "returns the path itself" do
@@ -10,7 +38,7 @@ module Rscons
 
       context "when passed an absolute path" do
         before(:each) do
-          expect(Rscons).to receive(:absolute_path?).and_return(true)
+          expect(Util).to receive(:absolute_path?).and_return(true)
         end
 
         context "on Windows" do
@@ -19,7 +47,7 @@ module Rscons
           end
         end
 
-        context "on POSIX" do
+        context "on non-Windows" do
           it "returns a relative path corresponding to an absolute one" do
             expect(Util.make_relative_path("/foo/bar")).to eq "_/foo/bar"
           end
diff --git a/spec/rscons_spec.rb b/spec/rscons_spec.rb
index 7627237..6e45ad7 100644
--- a/spec/rscons_spec.rb
+++ b/spec/rscons_spec.rb
@@ -1,31 +1,4 @@
 describe Rscons do
-  describe ".absolute_path?" do
-    context "on Windows" do
-      it "returns whether a path is absolute" do
-        stub_const("RUBY_PLATFORM", "mingw")
-        expect(Rscons.absolute_path?("/foo")).to be_truthy
-        expect(Rscons.absolute_path?("\\Windows")).to be_truthy
-        expect(Rscons.absolute_path?("C:\\Windows")).to be_truthy
-        expect(Rscons.absolute_path?("f:\\stuff")).to be_truthy
-        expect(Rscons.absolute_path?("g:/projects")).to be_truthy
-        expect(Rscons.absolute_path?("x:foo")).to be_falsey
-        expect(Rscons.absolute_path?("file.txt")).to be_falsey
-      end
-    end
-
-    context "not on Windows" do
-      it "returns whether a path is absolute" do
-        stub_const("RUBY_PLATFORM", "linux")
-        expect(Rscons.absolute_path?("/foo")).to be_truthy
-        expect(Rscons.absolute_path?("\\Windows")).to be_falsey
-        expect(Rscons.absolute_path?("C:\\Windows")).to be_falsey
-        expect(Rscons.absolute_path?("f:\\stuff")).to be_falsey
-        expect(Rscons.absolute_path?("g:/projects")).to be_falsey
-        expect(Rscons.absolute_path?("x:foo")).to be_falsey
-        expect(Rscons.absolute_path?("file.txt")).to be_falsey
-      end
-    end
-  end
 
   describe ".set_suffix" do
     it "changes the suffix to the new one" do
@@ -125,4 +98,5 @@ describe Rscons do
       end
     end
   end
+
 end