diff --git a/lib/puppet/type/postgresql_conf.rb b/lib/puppet/type/postgresql_conf.rb
index 432f5aa877..5cd753e20f 100644
--- a/lib/puppet/type/postgresql_conf.rb
+++ b/lib/puppet/type/postgresql_conf.rb
@@ -16,7 +16,7 @@
 
   newproperty(:value) do
     desc 'The value to set for this parameter.'
-    newvalues(%r{^\S(.*\S)?$})
+    newvalues(%r{^(\S.*)?$})
 
     munge do |value|
       if value.to_i.to_s == value
diff --git a/spec/unit/type/postgresql_conf_spec.rb b/spec/unit/type/postgresql_conf_spec.rb
index a2d54006be..f6e972f620 100644
--- a/spec/unit/type/postgresql_conf_spec.rb
+++ b/spec/unit/type/postgresql_conf_spec.rb
@@ -101,6 +101,12 @@
     end
     # string https://www.postgresql.org/docs/current/datatype-character.html
     describe 'validate complex string values with newvalues function' do
+      it 'validates log_line_prefix with value [%p] %q:%u:%d:%' do
+        expect { described_class.new(name: 'log_line_prefix', value: '[%p] %q:%u:%d:%x ') }.not_to raise_error
+      end
+      it 'validates log_line_prefix with value %t %q%u@%d %p %i' do
+        expect { described_class.new(name: 'log_line_prefix', value: '%t %q%u@%d %p %i ') }.not_to raise_error
+      end
       it 'validates log_filename with value psql_01-%Y-%m-%d.log' do
         expect { described_class.new(name: 'log_filename', value: 'psql_01-%Y-%m-%d.log') }.not_to raise_error
       end