diff --git a/module/VuFind/sql/migrations/pgsql/9.0/006-modify-boolean-fields.sql b/module/VuFind/sql/migrations/pgsql/9.0/006-modify-boolean-fields.sql
new file mode 100644
index 00000000000..a978bd49ae0
--- /dev/null
+++ b/module/VuFind/sql/migrations/pgsql/9.0/006-modify-boolean-fields.sql
@@ -0,0 +1,18 @@
+--
+-- Modifications to table `search`
+--
+
+ALTER TABLE "search"
+  ALTER COLUMN saved DROP DEFAULT,
+  ALTER COLUMN saved TYPE boolean USING saved::boolean,
+  ALTER COLUMN saved SET NOT NULL,
+  ALTER COLUMN saved SET DEFAULT '0';
+--
+-- Modifications to table `user_list`
+--
+
+ALTER TABLE "user_list"
+  ALTER COLUMN public DROP DEFAULT,
+  ALTER COLUMN public TYPE boolean USING public::boolean,
+  ALTER COLUMN public SET NOT NULL,
+  ALTER COLUMN public SET DEFAULT '0';
\ No newline at end of file
diff --git a/module/VuFind/sql/mysql.sql b/module/VuFind/sql/mysql.sql
index eef3af002cd..5207588c586 100644
--- a/module/VuFind/sql/mysql.sql
+++ b/module/VuFind/sql/mysql.sql
@@ -138,7 +138,7 @@ CREATE TABLE `search` (
   `folder_id` int(11) DEFAULT NULL,
   `created` datetime NOT NULL DEFAULT '2000-01-01 00:00:00',
   `title` varchar(20) DEFAULT NULL,
-  `saved` int(1) NOT NULL DEFAULT '0',
+  `saved` tinyint(1) NOT NULL DEFAULT '0',
   `search_object` blob,
   `checksum` int(11) DEFAULT NULL,
   `notification_frequency` int(11) NOT NULL DEFAULT '0',
@@ -265,7 +265,7 @@ CREATE TABLE `user_list` (
   `title` varchar(200) NOT NULL,
   `description` text,
   `created` datetime NOT NULL DEFAULT '2000-01-01 00:00:00',
-  `public` int(11) NOT NULL DEFAULT '0',
+  `public` tinyint(1) NOT NULL DEFAULT '0',
   PRIMARY KEY (`id`),
   KEY `user_id` (`user_id`),
   CONSTRAINT `user_list_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE
diff --git a/module/VuFind/sql/pgsql.sql b/module/VuFind/sql/pgsql.sql
index 4b71608261c..1843b2d1b52 100644
--- a/module/VuFind/sql/pgsql.sql
+++ b/module/VuFind/sql/pgsql.sql
@@ -95,7 +95,7 @@ session_id varchar(128),
 folder_id int DEFAULT NULL,
 created timestamp NOT NULL DEFAULT '1970-01-01 00:00:00',
 title varchar(20) DEFAULT NULL,
-saved int NOT NULL DEFAULT '0',
+saved boolean NOT NULL DEFAULT '0',
 search_object bytea,
 checksum int DEFAULT NULL,
 notification_frequency int NOT NULL DEFAULT '0',
@@ -192,7 +192,7 @@ user_id int NOT NULL,
 title varchar(200) NOT NULL,
 description text DEFAULT NULL,
 created timestamp NOT NULL DEFAULT '1970-01-01 00:00:00',
-public int NOT NULL DEFAULT '0',
+public boolean NOT NULL DEFAULT '0',
 PRIMARY KEY (id)
 );
 CREATE INDEX user_list_user_id_idx ON user_list (user_id);
diff --git a/module/VuFind/src/VuFind/Controller/MyResearchController.php b/module/VuFind/src/VuFind/Controller/MyResearchController.php
index a90230a74d7..26c8063444d 100644
--- a/module/VuFind/src/VuFind/Controller/MyResearchController.php
+++ b/module/VuFind/src/VuFind/Controller/MyResearchController.php
@@ -541,7 +541,9 @@ protected function isDuplicateOfSavedSearch(
             $userId
         );
         foreach ($matches as $current) {
-            if ($current->saved === 1 && $current->id !== $rowToCheck->id) {
+            // $current->saved may be 1 (MySQL) or true (PostgreSQL), so we should
+            // avoid a strict === comparison here:
+            if ($current->saved == 1 && $current->id !== $rowToCheck->id) {
                 return $current->id;
             }
         }
diff --git a/module/VuFind/src/VuFind/Search/History.php b/module/VuFind/src/VuFind/Search/History.php
index 6728638e767..1d89a6e5a0c 100644
--- a/module/VuFind/src/VuFind/Search/History.php
+++ b/module/VuFind/src/VuFind/Search/History.php
@@ -118,6 +118,8 @@ public function getSearchHistory($userId = null)
         $saved = $schedule = $unsaved = [];
         foreach ($searchHistory as $current) {
             $search = $current->getSearchObject()->deminify($this->resultsManager);
+            // $current->saved may be 1 (MySQL) or true (PostgreSQL), so we should
+            // avoid a strict === comparison here:
             if ($current->saved == 1) {
                 $saved[] = $search;
             } else {