diff --git a/Source/astcenc.h b/Source/astcenc.h
index 4d8836d88c6a2246665de138fe829e68310dc345..e231a50452fe39d1da03f68b6142120d5a7ad765 100644
--- a/Source/astcenc.h
+++ b/Source/astcenc.h
@@ -916,6 +916,8 @@ ASTCENC_PUBLIC const char* astcenc_get_error_string(
 #ifdef ASTC_CUSTOMIZED_ENABLE
 #if defined(_WIN32) && !defined(__CYGWIN__)
 const LPCSTR g_astcCustomizedSo = "libastcCustomizedEncode.dll";
+#elif defined(__APPLE__)
+const std::string g_astcCustomizedSo = "libastcCustomizedEncode.dylib";
 #elif defined(BUILD_HMOS_SDK)
 const std::string g_astcCustomizedSo = "libastcCustomizedEncode.so";
 #else