diff --git a/magic.c b/magic.c
index b8cf207..5afafd0 100644
--- a/magic.c
+++ b/magic.c
@@ -155,50 +155,52 @@ static void magic_set_error (int type, const char * format, ...) {
 	va_list       args;
 	char        * buffer     = NULL;
 	int           buffer_len = 0;
+	size_t        maxlen = 0;
 #if PHP_VERSION_ID >= 80000
 	zend_string * zbuffer;
 #endif
 
 	// php_error_cb in main.c
 	va_start (args, format);
-	buffer_len = vspprintf (&buffer, PG(log_errors_max_len), format, args);
+#if PHP_VERSION_ID < 80100
+	maxlen = PG(log_errors_max_len);
+#endif
+	buffer_len = vspprintf (&buffer, maxlen, format, args);
 	va_end (args);
 
 #if PHP_VERSION_ID >= 80000
 	zbuffer = zend_string_init (buffer, buffer_len, 0);
 #endif
 
-#if PHP_VERSION_ID >= 80000
-	if (PG(last_error_message)) {
-		zend_string_release(PG(last_error_message));
-		PG(last_error_message) = NULL;
-	}
-	if (PG(last_error_file)) {
-		free(PG(last_error_file));
-		PG(last_error_file) = NULL;
-	}
-#else
 	if ( PG (last_error_message) ) {
-	#if PHP_VERSION_ID >= 70200
-		char * s = PG(last_error_message);
-		PG(last_error_message) = NULL;
+#if PHP_VERSION_ID >= 80000
+		zend_string_release (PG (last_error_message));
+#elif PHP_VERSION_ID >= 70200
+		char * s = PG (last_error_message);
+		PG (last_error_message) = NULL;
 		free (s);
-	#else
+#else
 		free (PG (last_error_message));
-		PG (last_error_message) = NULL;
-	#endif
-	}
-	if ( PG(last_error_file) ) {
-	#if PHP_VERSION_ID >= 70200
-		char * s = PG(last_error_file);
+#endif
 		PG(last_error_file) = NULL;
+	}
+
+	if ( PG (last_error_file) ) {
+#if PHP_VERSION_ID >= 80100
+		zend_string_release (PG (last_error_file));
+#elif PHP_VERSION_ID >= 80000
+		free (PG (last_error_file));
+#elif PHP_VERSION_ID >= 70200
+		char * s = PG (last_error_file);
+		PG (last_error_file) = NULL;
 		free (s);
-	#else
+#else
 		free (PG (last_error_file));
+#endif
 		PG (last_error_file) = NULL;
-	#endif
 	}
-#endif
+
+
 	PG (last_error_lineno) = 0;
 
 	/*
@@ -215,10 +217,18 @@ static void magic_set_error (int type, const char * format, ...) {
 	PG (last_error_message) = strdup (buffer);
 #endif
 	if ( zend_is_compiling () ) {
+#if PHP_VERSION_ID >= 80100
+		PG (last_error_file) = zend_string_copy (zend_get_compiled_filename ());
+#else
 		PG (last_error_file) = strdup (ZSTR_VAL (zend_get_compiled_filename ()));
+#endif
 		PG (last_error_lineno) = zend_get_compiled_lineno ();
 	} else if ( zend_is_executing () ) {
+#if PHP_VERSION_ID >= 80100
+		PG (last_error_file) = zend_string_copy (zend_get_executed_filename_ex ());
+#else
 		PG (last_error_file) = strdup (zend_get_executed_filename ());
+#endif
 		PG (last_error_lineno) = zend_get_executed_lineno ();
 	}
 
diff --git a/package.xml.tmpl b/package.xml.tmpl
index d871451..45ecf98 100644
--- a/package.xml.tmpl
+++ b/package.xml.tmpl
@@ -24,6 +24,7 @@
 	<license uri="https://raw.githubusercontent.com/OOPS-ORG-PHP/mod_magic/master/LICENSE">BSD 3-Clause</license>
 	<notes>
 		- #11 make test 007 failure on PHP 7.2 and after
+		- #12 build failure in PHP 8.1
 	</notes>
 	<contents>
 		<dir name="/">
@@ -66,6 +67,7 @@
 			<date>@curdate@</date>
 			<notes>
 				- #11 make test 007 failure on PHP 7.2 and after
+				- #12 build failure in PHP 8.1
 			</notes>
 		</release>
 		<release>
diff --git a/tests/008-error-get-last.phpt b/tests/008-error-get-last.phpt
index ac53720..df3f0f0 100644
--- a/tests/008-error-get-last.phpt
+++ b/tests/008-error-get-last.phpt
@@ -16,7 +16,7 @@ if ( filemagic ('modules/magic.so1') == false ) {
 	if ( $p['type'] == E_WARNING )
 		$s = 'E_WARNING';
 	else
-		$s = 'E_UNKNONW';
+		$s = 'E_UNKNOWN';
 	printf ("%s: %s\n", $s, $p['message']);
 }
 ?>