diff --git a/src/SPC/builder/unix/library/gmp.php b/src/SPC/builder/unix/library/gmp.php
index f625274f..97a88ba1 100644
--- a/src/SPC/builder/unix/library/gmp.php
+++ b/src/SPC/builder/unix/library/gmp.php
@@ -14,7 +14,9 @@ trait gmp
             ->appendEnv([
                 'CFLAGS' => '-std=c17',
             ])
-            ->configure()
+            ->configure(
+                '--enable-fat'
+            )
             ->make();
         $this->patchPkgconfPrefix(['gmp.pc']);
     }
diff --git a/src/globals/test-extensions.php b/src/globals/test-extensions.php
index d9202e08..e2186c8e 100644
--- a/src/globals/test-extensions.php
+++ b/src/globals/test-extensions.php
@@ -50,7 +50,7 @@ $prefer_pre_built = false;
 
 // If you want to test your added extensions and libs, add below (comma separated, example `bcmath,openssl`).
 $extensions = match (PHP_OS_FAMILY) {
-    'Linux', 'Darwin' => 'mysqli',
+    'Linux', 'Darwin' => 'mysqli,gmp',
     'Windows' => 'bcmath',
 };