diff --git a/beep/functions.php b/beep/functions.php
index abb86fe55a..ac2c42502a 100644
--- a/beep/functions.php
+++ b/beep/functions.php
@@ -7,7 +7,7 @@
  * @package Beep
  * @since Beep 1.0
  */
-
+declare( strict_types = 1 );
 
 if ( ! function_exists( 'beep_support' ) ) :
 
diff --git a/ici/functions.php b/ici/functions.php
index 5f617aadae..430f2d9260 100644
--- a/ici/functions.php
+++ b/ici/functions.php
@@ -7,7 +7,7 @@
  * @package Ici
  * @since Ici 1.0
  */
-
+declare( strict_types = 1 );
 
 if ( ! function_exists( 'ici_support' ) ) :
 
diff --git a/indice/functions.php b/indice/functions.php
index 6ee3caaec4..03937eeb97 100644
--- a/indice/functions.php
+++ b/indice/functions.php
@@ -8,6 +8,8 @@
  * @since indice 1.0
  */
 
+declare( strict_types = 1 );
+
 if ( ! function_exists( 'indice_support' ) ) :
 
 	/**
diff --git a/spiel/functions.php b/spiel/functions.php
index 59204f4b2d..cc7044b760 100644
--- a/spiel/functions.php
+++ b/spiel/functions.php
@@ -7,7 +7,7 @@
  * @package Spiel
  * @since Spiel 1.0
  */
-
+declare( strict_types = 1 );
 
 if ( ! function_exists( 'spiel_support' ) ) :
 
diff --git a/xanadu/functions.php b/xanadu/functions.php
index cba59b18d9..a5bcd44e6a 100644
--- a/xanadu/functions.php
+++ b/xanadu/functions.php
@@ -7,7 +7,7 @@
  * @package Xanadu
  * @since Xanadu 1.0
  */
-
+declare( strict_types = 1 );
 
 if ( ! function_exists( 'xanadu_support' ) ) :