diff --git a/src/SPC/builder/linux/LinuxBuilder.php b/src/SPC/builder/linux/LinuxBuilder.php
index 33db12d3..88e0a71d 100644
--- a/src/SPC/builder/linux/LinuxBuilder.php
+++ b/src/SPC/builder/linux/LinuxBuilder.php
@@ -330,7 +330,7 @@ class LinuxBuilder extends UnixBuilderBase
 
         if (getenv('SPC_CMD_VAR_PHP_EMBED_TYPE') === 'static') {
             $AR = getenv('AR') ?: 'ar';
-            f_passthru("{$AR} -t " . BUILD_LIB_PATH . "/libphp.a | grep '\\.a$' | xargs -n1 ar d " . BUILD_LIB_PATH . '/libphp.a');
+            f_passthru("{$AR} -t " . BUILD_LIB_PATH . "/libphp.a | grep '\\.a$' | xargs -n1 {$AR} d " . BUILD_LIB_PATH . '/libphp.a');
         }
 
         if (!$this->getOption('no-strip', false) && file_exists(BUILD_LIB_PATH . '/' . $realLibName)) {
diff --git a/src/SPC/builder/macos/MacOSBuilder.php b/src/SPC/builder/macos/MacOSBuilder.php
index b8d59098..a74b6f14 100644
--- a/src/SPC/builder/macos/MacOSBuilder.php
+++ b/src/SPC/builder/macos/MacOSBuilder.php
@@ -268,7 +268,7 @@ class MacOSBuilder extends UnixBuilderBase
 
         if (getenv('SPC_CMD_VAR_PHP_EMBED_TYPE') === 'static') {
             $AR = getenv('AR') ?: 'ar';
-            f_passthru("{$AR} -t " . BUILD_LIB_PATH . "/libphp.a | grep '\\.a$' | xargs -n1 ar d " . BUILD_LIB_PATH . '/libphp.a');
+            f_passthru("{$AR} -t " . BUILD_LIB_PATH . "/libphp.a | grep '\\.a$' | xargs -n1 {$AR} d " . BUILD_LIB_PATH . '/libphp.a');
         }
         $this->patchPhpScripts();
     }
diff --git a/src/SPC/builder/unix/library/libxslt.php b/src/SPC/builder/unix/library/libxslt.php
index c5315cbf..1c584be2 100644
--- a/src/SPC/builder/unix/library/libxslt.php
+++ b/src/SPC/builder/unix/library/libxslt.php
@@ -47,7 +47,7 @@ trait libxslt
         $this->patchLaDependencyPrefix();
         $AR = getenv('AR') ?: 'ar';
         shell()->cd(BUILD_LIB_PATH)
-            ->exec("{$AR} -t libxslt.a | grep '\\.a$' | xargs -n1 ar d libxslt.a")
-            ->exec("{$AR} -t libexslt.a | grep '\\.a$' | xargs -n1 ar d libexslt.a");
+            ->exec("{$AR} -t libxslt.a | grep '\\.a$' | xargs -n1 {$AR} d libxslt.a")
+            ->exec("{$AR} -t libexslt.a | grep '\\.a$' | xargs -n1 {$AR} d libexslt.a");
     }
 }
diff --git a/src/SPC/builder/unix/library/ngtcp2.php b/src/SPC/builder/unix/library/ngtcp2.php
index bb993d42..e2c4ed09 100644
--- a/src/SPC/builder/unix/library/ngtcp2.php
+++ b/src/SPC/builder/unix/library/ngtcp2.php
@@ -49,6 +49,6 @@ trait ngtcp2
         // on macOS, the static library may contain other static libraries?
         // ld: archive member 'libssl.a' not a mach-o file in libngtcp2_crypto_ossl.a
         $AR = getenv('AR') ?: 'ar';
-        shell()->cd(BUILD_LIB_PATH)->exec("{$AR} -t libngtcp2_crypto_ossl.a | grep '\\.a$' | xargs -n1 ar d libngtcp2_crypto_ossl.a");
+        shell()->cd(BUILD_LIB_PATH)->exec("{$AR} -t libngtcp2_crypto_ossl.a | grep '\\.a$' | xargs -n1 {$AR} d libngtcp2_crypto_ossl.a");
     }
 }