diff --git a/adminer/include/coverage.inc.php b/adminer/include/coverage.inc.php
index 1883c66a..f2c8e717 100644
--- a/adminer/include/coverage.inc.php
+++ b/adminer/include/coverage.inc.php
@@ -1,23 +1,16 @@
 <?php
 // coverage is used in tests and removed in compilation
-if (extension_loaded("xdebug") && function_exists('mysql_query') && mysql_query('SELECT 1 FROM adminer_test.coverage LIMIT 0')) {
+if (extension_loaded("xdebug") && file_exists(sys_get_temp_dir() . "/adminer_coverage.ser")) {
 	function save_coverage() {
-		$coverage = array();
-		$result = mysql_query("SELECT filename, coverage_serialize FROM adminer_test.coverage");
-		while ($row = mysql_fetch_assoc($result)) {
-			$coverage[$row["filename"]] = unserialize($row["coverage_serialize"]);
-		}
-		mysql_free_result($result);
+		$coverage_filename = sys_get_temp_dir() . "/adminer_coverage.ser";
+		$coverage = unserialize(file_get_contents($coverage_filename));
 		foreach (xdebug_get_code_coverage() as $filename => $lines) {
 			foreach ($lines as $l => $val) {
 				if (!$coverage[$filename][$l] || $val > 0) {
 					$coverage[$filename][$l] = $val;
 				}
 			}
-			mysql_query("
-				REPLACE adminer_test.coverage (filename, coverage_serialize)
-				VALUES ('" . mysql_real_escape_string($filename) . "', '" . mysql_real_escape_string(serialize($coverage[$filename])) . "')
-			");
+			file_put_contents($coverage_filename, serialize($coverage));
 		}
 	}
 	xdebug_start_code_coverage(XDEBUG_CC_UNUSED | XDEBUG_CC_DEAD_CODE);
diff --git a/coverage.php b/coverage.php
index 794946df..ac2b6576 100644
--- a/coverage.php
+++ b/coverage.php
@@ -22,28 +22,23 @@ function xhtml_open_tags($s) {
 	return $return;
 }
 
+$coverage_filename = sys_get_temp_dir() . "/adminer_coverage.ser";
 if (!extension_loaded("xdebug")) {
 	echo "<p class='error'>Xdebug has to be enabled.</p>\n";
 } elseif ($_GET["coverage"] === "0") {
-	mysql_query("DROP TABLE IF EXISTS adminer_test.coverage");
-	mysql_query("CREATE TABLE adminer_test.coverage (
-		filename varchar(100) NOT NULL,
-		coverage_serialize mediumtext NOT NULL,
-		PRIMARY KEY (filename)
-	)");
+	file_put_contents($coverage_filename, serialize(array()));
 	echo "<p class='message'>Coverage started.</p>\n";
 } elseif (preg_match('~^(adminer|editor)/(include/)?[-_.a-z0-9]+$~i', $_GET["coverage"])) {
 	// highlight single file
 	$filename = $_GET["coverage"];
-	$row = mysql_fetch_row(mysql_query("SELECT coverage_serialize FROM adminer_test.coverage WHERE filename = '" . mysql_real_escape_string(realpath($filename)) . "'"));
-	$cov = ($row ? unserialize($row[0]) : array());
+	$coverage = (file_exists($coverage_filename) ? unserialize(file_get_contents($coverage_filename)) : array());
 	$file = explode("<br />", highlight_file($filename, true));
 	unset($prev_color);
 	$s = "";
 	for ($l=0; $l <= count($file); $l++) {
 		$line = $file[$l];
 		$color = "#C0FFC0"; // tested
-		switch ($cov[$l+1]) {
+		switch ($coverage[realpath($filename)][$l+1]) {
 			case -1: $color = "#FFC0C0"; break; // untested
 			case -2: $color = "Silver"; break; // dead code
 			case null: $color = ""; break; // not executable
@@ -64,21 +59,16 @@ if (!extension_loaded("xdebug")) {
 		$s .= "$line<br />\n";
 	}
 } else {
-	// display list of files
-	$result = mysql_query("SELECT filename, coverage_serialize FROM adminer_test.coverage");
-	if ($result) {
+	if (file_exists($coverage_filename)) {
+		// display list of files
+		$coverage = unserialize(file_get_contents($coverage_filename));
 		echo "<table border='1' cellspacing='0'>\n";
-		$coverage = array();
-		while ($row = mysql_fetch_assoc($result)) {
-			$coverage[$row["filename"]] = unserialize($row["coverage_serialize"]);
-		}
-		mysql_free_result($result);
 		foreach (array_merge(glob("adminer/*.php"), glob("adminer/include/*.php"), glob("editor/*.php"), glob("editor/include/*.php")) as $filename) {
 			$cov = $coverage[realpath($filename)];
 			$ratio = 0;
 			if (is_array($cov)) {
 				$values = array_count_values($cov);
-				$ratio = round(100 - 100 * $values[-1] / count($cov));
+				$ratio = round(100 - 100 * $values[-1] / (count($cov) - $values[-2]));
 			}
 			echo "<tr><td align='right' style='background-color: " . ($ratio < 50 ? "Red" : ($ratio < 75 ? "#FFEA20" : "#A7FC9D")) . ";'>$ratio%</td><td><a href='coverage.php?coverage=$filename'>$filename</a></td></tr>\n";
 		}
diff --git a/tests/0-login.html b/tests/0-login.html
index 8e741f73..8cd77a45 100644
--- a/tests/0-login.html
+++ b/tests/0-login.html
@@ -11,6 +11,11 @@
 <thead>
 <tr><td rowspan="1" colspan="3">Create database</td></tr>
 </thead><tbody>
+<tr>
+	<td>open</td>
+	<td>/adminer/coverage.php?coverage=0</td>
+	<td></td>
+</tr>
 <tr>
 	<td>open</td>
 	<td>/adminer/adminer/?lang=en&amp;username=</td>
diff --git a/tests/1-create-database.html b/tests/1-create-database.html
index f44f7851..5ff2dc98 100644
--- a/tests/1-create-database.html
+++ b/tests/1-create-database.html
@@ -41,11 +41,6 @@
 	<td>Database has been created.</td>
 	<td></td>
 </tr>
-<tr>
-	<td>open</td>
-	<td>/adminer/coverage.php?coverage=0</td>
-	<td></td>
-</tr>
 
 </tbody></table>
 </body>