diff --git a/lib/listen/monotonic_time.rb b/lib/listen/monotonic_time.rb
index 424073af..51b0fc9d 100644
--- a/lib/listen/monotonic_time.rb
+++ b/lib/listen/monotonic_time.rb
@@ -3,14 +3,24 @@
 module Listen
   module MonotonicTime
     class << self
-      def now
-        if defined?(Process::CLOCK_MONOTONIC)
+      if defined?(Process::CLOCK_MONOTONIC)
+
+        def now
           Process.clock_gettime(Process::CLOCK_MONOTONIC)
-        elsif defined?(Process::CLOCK_MONOTONIC_RAW)
+        end
+
+      elsif defined?(Process::CLOCK_MONOTONIC_RAW)
+
+        def now
           Process.clock_gettime(Process::CLOCK_MONOTONIC_RAW)
-        else
+        end
+
+      else
+
+        def now
           Time.now.to_f
         end
+
       end
     end
   end
diff --git a/spec/lib/listen/monotonic_time_spec.rb b/spec/lib/listen/monotonic_time_spec.rb
index 0ae8db96..4c21f46a 100644
--- a/spec/lib/listen/monotonic_time_spec.rb
+++ b/spec/lib/listen/monotonic_time_spec.rb
@@ -3,6 +3,11 @@
 require 'listen/monotonic_time'
 
 RSpec.describe Listen::MonotonicTime do
+  after(:all) do
+    # load once more with constants unstubbed/unhidden
+    load './lib/listen/monotonic_time.rb'
+  end
+
   context 'module methods' do
     describe '.now' do
       subject { described_class.now }
@@ -11,6 +16,7 @@
       context 'when CLOCK_MONOTONIC defined' do
         before do
           stub_const('Process::CLOCK_MONOTONIC', 10)
+          load './lib/listen/monotonic_time.rb'
         end
 
         it 'returns the CLOCK_MONOTONIC tick count' do
@@ -23,6 +29,7 @@
         before do
           hide_const('Process::CLOCK_MONOTONIC')
           stub_const('Process::CLOCK_MONOTONIC_RAW', 11)
+          load './lib/listen/monotonic_time.rb'
         end
 
         it 'returns the floating point Time.now' do
@@ -37,6 +44,7 @@
         before do
           hide_const('Process::CLOCK_MONOTONIC')
           hide_const('Process::CLOCK_MONOTONIC_RAW')
+          load './lib/listen/monotonic_time.rb'
         end
 
         it 'returns the floating point Time.now' do