diff --git a/lib/puppet/type/ceph_config.rb b/lib/puppet/type/ceph_config.rb
index 5a44472d..6b36d3a8 100644
--- a/lib/puppet/type/ceph_config.rb
+++ b/lib/puppet/type/ceph_config.rb
@@ -42,7 +42,7 @@ Puppet::Type.newtype(:ceph_config) do
     desc 'The value of the setting to be defined.'
     munge do |value|
       value = value.to_s.strip
-      value.capitalize! if value =~ /^(true|false)$/i
+      value.downcase! if value =~ /^(true|false)$/i
       value
     end
   end
diff --git a/spec/unit/type/ceph_config_spec.rb b/spec/unit/type/ceph_config_spec.rb
index c78dfb68..b51ee8d1 100644
--- a/spec/unit/type/ceph_config_spec.rb
+++ b/spec/unit/type/ceph_config_spec.rb
@@ -29,13 +29,13 @@ describe 'Puppet::Type.type(:ceph_config)' do
     expect(@ceph_config[:value]).to eq('max')
   end
 
-  it 'should convert true to True' do
+  it 'should convert true to true' do
     @ceph_config[:value] = 'tRuE'
-    expect(@ceph_config[:value]).to eq('True')
+    expect(@ceph_config[:value]).to eq('true')
   end
 
-  it 'should convert false to False' do
+  it 'should convert false to false' do
     @ceph_config[:value] = 'fAlSe'
-    expect(@ceph_config[:value]).to eq('False')
+    expect(@ceph_config[:value]).to eq('false')
   end
-end
\ No newline at end of file
+end