diff --git a/wp-admin/includes/ajax-actions.php b/wp-admin/includes/ajax-actions.php
index a4e4e810df..9b03c403e2 100644
--- a/wp-admin/includes/ajax-actions.php
+++ b/wp-admin/includes/ajax-actions.php
@@ -3528,7 +3528,10 @@ function wp_ajax_get_revision_diffs() {
 	}
 
 	$return = array();
-	set_time_limit( 0 );
+
+	if ( function_exists( 'set_time_limit' ) ) {
+		set_time_limit( 0 );
+	}
 
 	foreach ( $_REQUEST['compare'] as $compare_key ) {
 		list( $compare_from, $compare_to ) = explode( ':', $compare_key ); // from:to
diff --git a/wp-admin/includes/class-wp-upgrader.php b/wp-admin/includes/class-wp-upgrader.php
index 1b2df949cf..f6653af742 100644
--- a/wp-admin/includes/class-wp-upgrader.php
+++ b/wp-admin/includes/class-wp-upgrader.php
@@ -471,7 +471,9 @@ class WP_Upgrader {
 		$destination       = $args['destination'];
 		$clear_destination = $args['clear_destination'];
 
-		set_time_limit( 300 );
+		if ( function_exists( 'set_time_limit' ) ) {
+			set_time_limit( 300 );
+		}
 
 		if ( empty( $source ) || empty( $destination ) ) {
 			return new WP_Error( 'bad_request', $this->strings['bad_request'] );
diff --git a/wp-admin/includes/file.php b/wp-admin/includes/file.php
index cc0c0a8af2..e3c1849cc9 100644
--- a/wp-admin/includes/file.php
+++ b/wp-admin/includes/file.php
@@ -540,7 +540,9 @@ function wp_edit_theme_plugin_file( $args ) {
 		}
 
 		// Make sure PHP process doesn't die before loopback requests complete.
-		set_time_limit( 5 * MINUTE_IN_SECONDS );
+		if ( function_exists( 'set_time_limit' ) ) {
+			set_time_limit( 5 * MINUTE_IN_SECONDS );
+		}
 
 		// Time to wait for loopback requests to finish.
 		$timeout = 100; // 100 seconds.
diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index 005d70cbf6..ac305ada4a 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -1053,7 +1053,9 @@ $_new_bundled_files = array(
 function update_core( $from, $to ) {
 	global $wp_filesystem, $_old_files, $_old_requests_files, $_new_bundled_files, $wpdb;
 
-	set_time_limit( 300 );
+	if ( function_exists( 'set_time_limit' ) ) {
+		set_time_limit( 300 );
+	}
 
 	/*
 	 * Merge the old Requests files and directories into the `$_old_files`.
diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index 53c6b5df2d..e3d869e9f6 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -3111,7 +3111,10 @@ function pingback( $content, $post ) {
 		$pingback_server_url = discover_pingback_server_uri( $pagelinkedto );
 
 		if ( $pingback_server_url ) {
-			set_time_limit( 60 );
+			if ( function_exists( 'set_time_limit' ) ) {
+				set_time_limit( 60 );
+			}
+
 			// Now, the RPC call.
 			$pagelinkedfrom = get_permalink( $post );
 
diff --git a/wp-includes/deprecated.php b/wp-includes/deprecated.php
index 3787d71297..280083114c 100644
--- a/wp-includes/deprecated.php
+++ b/wp-includes/deprecated.php
@@ -3659,7 +3659,9 @@ function post_permalink( $post = 0 ) {
 function wp_get_http( $url, $file_path = false, $red = 1 ) {
 	_deprecated_function( __FUNCTION__, '4.4.0', 'WP_Http' );
 
-	@set_time_limit( 60 );
+	if ( function_exists( 'set_time_limit' ) ) {
+		@set_time_limit( 60 );
+	}
 
 	if ( $red > 5 )
 		return false;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 56f7df0e15..5aeb52b434 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-alpha-55257';
+$wp_version = '6.2-alpha-55258';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.