diff --git a/src/Package/Extension/opentelemetry.php b/src/Package/Extension/opentelemetry.php
index 632d1257..6c106f7f 100644
--- a/src/Package/Extension/opentelemetry.php
+++ b/src/Package/Extension/opentelemetry.php
@@ -7,15 +7,21 @@ namespace Package\Extension;
 use Package\Target\php;
 use StaticPHP\Attribute\Package\BeforeStage;
 use StaticPHP\Attribute\Package\Extension;
+use StaticPHP\Toolchain\Interface\ToolchainInterface;
+use StaticPHP\Toolchain\ZigToolchain;
 use StaticPHP\Util\GlobalEnvManager;
 
 #[Extension('opentelemetry')]
 class opentelemetry
 {
     #[BeforeStage('php', [php::class, 'makeForUnix'], 'ext-opentelemetry')]
-    public function patchBeforeMake(): void
+    public function patchBeforeMake(ToolchainInterface $toolchain): void
     {
-        // add -Wno-strict-prototypes
-        GlobalEnvManager::putenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS=' . getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS') . ' -Wno-strict-prototypes');
+        $extra_cflags = getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS') ?: '';
+        $extra_cflags .= ' -Wno-strict-prototypes';
+        if ($toolchain instanceof ZigToolchain) {
+            $extra_cflags .= ' -Wno-unknown-warning-option';
+        }
+        GlobalEnvManager::putenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS=' . trim($extra_cflags));
     }
 }