diff --git a/ext/posix/config.m4 b/ext/posix/config.m4
index 865546356953..4b795016fb07 100644
--- a/ext/posix/config.m4
+++ b/ext/posix/config.m4
@@ -42,12 +42,7 @@ if test "$PHP_POSIX" = "yes"; then
       #endif
     ])])
 
-dnl Skip pathconf and fpathconf check on musl libc due to limited implementation
-dnl (first argument is not validated and has different error).
-  PHP_C_STANDARD_LIBRARY
-  AS_VAR_IF([php_cv_c_standard_library], [musl],
-    [],
-    [AC_CHECK_FUNCS([pathconf fpathconf])])
+  AC_CHECK_FUNCS([pathconf fpathconf])
 
   AC_CACHE_CHECK([for working ttyname_r() implementation],
     [php_cv_func_ttyname_r],
diff --git a/ext/posix/tests/posix_pathconf.phpt b/ext/posix/tests/posix_pathconf.phpt
index ba451c62df97..8df6e872119b 100644
--- a/ext/posix/tests/posix_pathconf.phpt
+++ b/ext/posix/tests/posix_pathconf.phpt
@@ -13,12 +13,15 @@ try {
 } catch (\ValueError $e) {
 	echo $e->getMessage(). "\n";
 }
-var_dump(posix_pathconf(str_repeat('non_existent', 4096), POSIX_PC_NAME_MAX));
-var_dump(posix_errno() != 0);
+
+/* POSIX specifically allows implementations to ignore the first
+ * argument if it will not affect the result. */
+$result = posix_pathconf(str_repeat('non_existent', 4096),
+                         POSIX_PC_NAME_MAX);
+var_dump( ($result == false && posix_errno() != 0) || is_int($result) );
 var_dump(posix_pathconf(sys_get_temp_dir(), POSIX_PC_PATH_MAX));
 ?>
 --EXPECTF--
 posix_pathconf(): Argument #1 ($path) must not be empty
-bool(false)
 bool(true)
 int(%d)