diff --git a/composer.json b/composer.json
index 7ac30bc1..38cc232b 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,8 @@
   "prefer-stable": true,
   "require": {
     "php": "^7.4 || ^8.0",
-    "ext-json": "*"
+    "ext-json": "*",
+    "ext-mbstring": "*"
   },
   "require-dev": {
     "composer/xdebug-handler": "^2.0",
diff --git a/src/Instrumentation/PDO/src/PDOInstrumentation.php b/src/Instrumentation/PDO/src/PDOInstrumentation.php
index 16ae59ee..51e7e433 100644
--- a/src/Instrumentation/PDO/src/PDOInstrumentation.php
+++ b/src/Instrumentation/PDO/src/PDOInstrumentation.php
@@ -70,7 +70,7 @@ public static function register(): void
                 $builder = self::makeBuilder($instrumentation, 'PDO::query', $function, $class, $filename, $lineno)
                     ->setSpanKind(SpanKind::KIND_CLIENT);
                 if ($class === PDO::class) {
-                    $builder->setAttribute(TraceAttributes::DB_STATEMENT, $params[0] ?? 'undefined');
+                    $builder->setAttribute(TraceAttributes::DB_STATEMENT, mb_convert_encoding($params[0], 'UTF-8') ?? 'undefined');
                 }
                 $parent = Context::getCurrent();
                 $span = $builder->startSpan();
@@ -93,7 +93,7 @@ public static function register(): void
                 $builder = self::makeBuilder($instrumentation, 'PDO::exec', $function, $class, $filename, $lineno)
                     ->setSpanKind(SpanKind::KIND_CLIENT);
                 if ($class === PDO::class) {
-                    $builder->setAttribute(TraceAttributes::DB_STATEMENT, $params[0] ?? 'undefined');
+                    $builder->setAttribute(TraceAttributes::DB_STATEMENT, mb_convert_encoding($params[0], 'UTF-8') ?? 'undefined');
                 }
                 $parent = Context::getCurrent();
                 $span = $builder->startSpan();
@@ -116,7 +116,7 @@ public static function register(): void
                 $builder = self::makeBuilder($instrumentation, 'PDO::prepare', $function, $class, $filename, $lineno)
                     ->setSpanKind(SpanKind::KIND_CLIENT);
                 if ($class === PDO::class) {
-                    $builder->setAttribute(TraceAttributes::DB_STATEMENT, $params[0] ?? 'undefined');
+                    $builder->setAttribute(TraceAttributes::DB_STATEMENT, mb_convert_encoding($params[0], 'UTF-8') ?? 'undefined');
                 }
                 $parent = Context::getCurrent();
                 $span = $builder->startSpan();