diff --git a/lib/Catalyst/Plugin/RapidApp/NavCore/Controller.pm b/lib/Catalyst/Plugin/RapidApp/NavCore/Controller.pm
index e586b0a7..bf11537d 100644
--- a/lib/Catalyst/Plugin/RapidApp/NavCore/Controller.pm
+++ b/lib/Catalyst/Plugin/RapidApp/NavCore/Controller.pm
@@ -8,7 +8,7 @@ use RapidApp::Util qw(:all);
 require Module::Runtime;
 require Catalyst::Utils;
 
-use JSON qw(decode_json);
+use JSON::MaybeXS qw(decode_json);
 
 # Controller for loading a saved search in CoreSchema via ID
 
diff --git a/lib/RapidApp/JSON/MixedEncoder.pm b/lib/RapidApp/JSON/MixedEncoder.pm
index 18c5bbb3..50335dc2 100644
--- a/lib/RapidApp/JSON/MixedEncoder.pm
+++ b/lib/RapidApp/JSON/MixedEncoder.pm
@@ -40,12 +40,12 @@ our %SCALARREF_VALUE_MAP = (
 # ---
 
 
-# copied from JSON::PP
+# copied from JSON::PP, but match prototypes to Cpanel::JSON::XS.
 my $JSON; # cache
-sub encode_json ($) { # encode
+sub encode_json ($;$) { # encode
 	($JSON ||= __PACKAGE__->new)->encode($_[0]);
 }
-sub decode_json ($) { # decode
+sub decode_json ($;$$) { # decode
 	($JSON ||= __PACKAGE__->new)->decode($_[0]);
 }
 
diff --git a/lib/RapidApp/Test.pm b/lib/RapidApp/Test.pm
index 9628b83a..2cf07bd2 100644
--- a/lib/RapidApp/Test.pm
+++ b/lib/RapidApp/Test.pm
@@ -7,7 +7,7 @@ use Import::Into;
 
 use Time::HiRes qw(gettimeofday tv_interval);
 use HTTP::Request::Common;
-use JSON qw(decode_json);
+use JSON::MaybeXS qw(decode_json);
 use Catalyst::Utils;
 use RapidApp::Test::Client;
 
diff --git a/lib/RapidApp/Test/Client.pm b/lib/RapidApp/Test/Client.pm
index 2f8222f4..acdd43f5 100644
--- a/lib/RapidApp/Test/Client.pm
+++ b/lib/RapidApp/Test/Client.pm
@@ -13,7 +13,7 @@ use Scalar::Util qw(blessed);
 use Time::HiRes qw(gettimeofday tv_interval);
 use LWP::UserAgent;
 use HTTP::Request::Common;
-use JSON qw(decode_json);
+use JSON::MaybeXS qw(decode_json);
 use Try::Tiny;
 
 # shorthand aliases:
diff --git a/lib/RapidApp/Util/MetaKeys.pm b/lib/RapidApp/Util/MetaKeys.pm
index 3840c17f..df7d7e2c 100644
--- a/lib/RapidApp/Util/MetaKeys.pm
+++ b/lib/RapidApp/Util/MetaKeys.pm
@@ -9,7 +9,7 @@ use Types::Standard qw(:all);
 use Scalar::Util qw(blessed);
 
 use RapidApp::Util::MetaKeys::FK;
-use JSON qw( from_json -support_by_pp );
+use JSON::MaybeXS qw( from_json );
 use Path::Class qw( file dir );
 use Try::Tiny;