diff --git a/.travis.yml b/.travis.yml
index 3e25b1d0..ccb4ec80 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,5 @@
 language: php
 php:
-  - '5.5'
   - '5.6'
-  - '7.0'
-  - hhvm
-  - nightly
 
 script: make test
diff --git a/conf/sample.config.inc.php b/conf/sample.config.inc.php
index fe51fbb4..6b88f2fa 100644
--- a/conf/sample.config.inc.php
+++ b/conf/sample.config.inc.php
@@ -32,7 +32,7 @@
  * one you want to report on.
  *
  */
- 
+
 foreach(glob("conf/datasource_*.inc.php") as $datasource) {
 	require_once($datasource);
 }
@@ -345,7 +345,7 @@
 	'callbacks'     => array(
 		'table' => array(
 			'date'  => function ($x) { $type=''; if ( date('N',strtotime($x)) >= 6) { $type = 'weekend'; } return array($x,$type); },
-			'checksum' => function ($x) { return array(dec2hex($x), ''); }
+			// 'checksum' => function ($x) { return array(dec2hex($x), ''); }
 		)
 	)
 
diff --git a/lib/Anemometer.php b/lib/Anemometer.php
index 6b14f51d..37af4b2e 100644
--- a/lib/Anemometer.php
+++ b/lib/Anemometer.php
@@ -368,7 +368,8 @@ private function translate_checksum($checksum)
         }
         else if (preg_match('/^[0-9A-Fa-f]+$/', $checksum))
         {
-            return $this->bchexdec($checksum);
+            //return $this->bchexdec($checksum);
+            return $checksum;
         }
         else if (strlen($checksum) == 0)
         {
diff --git a/lib/AnemometerModel.php b/lib/AnemometerModel.php
index 1742792f..19150730 100644
--- a/lib/AnemometerModel.php
+++ b/lib/AnemometerModel.php
@@ -198,7 +198,7 @@ public function get_reviewers() {
      */
     public function checksum_exists($checksum) {
         $checksum_field_name = $this->get_field_name('checksum');
-        $query = "SELECT `{$checksum_field_name}` FROM `{$this->fact_table}` WHERE `{$checksum_field_name}`=" . $this->mysqli->real_escape_string($checksum);
+        $query = "SELECT `{$checksum_field_name}` FROM `{$this->fact_table}` WHERE `{$checksum_field_name}`='" . $this->mysqli->real_escape_string($checksum). "'";
         $result = $this->mysqli->query($query);
         check_mysql_error($result, $this->mysqli);
         if ($result->num_rows) {
@@ -227,7 +227,7 @@ function ($x, $y) use ($mysqli) {
                         }, array_keys($fields), array_values($fields)
                 )
         );
-        $sql .= " WHERE `{$checksum_field_name}`=" . $this->mysqli->real_escape_string($checksum);
+        $sql .= " WHERE `{$checksum_field_name}`='" . $this->mysqli->real_escape_string($checksum) . "'";
         $res = $this->mysqli->query($sql);
         // @todo ... fix this by making it a local method
         check_mysql_error($res, $this->mysqli);
@@ -241,7 +241,7 @@ function ($x, $y) use ($mysqli) {
      */
     public function get_query_by_checksum($checksum) {
         $checksum_field_name = $this->get_field_name('checksum');
-        $result = $this->mysqli->query("SELECT * FROM `{$this->fact_table}` WHERE `{$checksum_field_name}`={$checksum}");
+        $result = $this->mysqli->query("SELECT * FROM `{$this->fact_table}` WHERE `{$checksum_field_name}`='{$checksum}'");
         check_mysql_error($result, $this->mysqli);
         if ($row = $result->fetch_assoc()) {
             return $row;
@@ -265,7 +265,7 @@ public function get_query_samples($checksum, $limit = 1, $offset = 0) {
         {
             $table = $this->fact_table;
         }
-        $sql = "SELECT * FROM `{$table}` WHERE `{$checksum_field_name}`={$checksum} ORDER BY `{$time_field_name}` DESC LIMIT {$limit} OFFSET {$offset}";
+        $sql = "SELECT * FROM `{$table}` WHERE `{$checksum_field_name}`='{$checksum}' ORDER BY `{$time_field_name}` DESC LIMIT {$limit} OFFSET {$offset}";
         return $this->mysqli->query($sql);
     }