diff --git a/mini_al.h b/mini_al.h
index e9cff556..007aeb1f 100644
--- a/mini_al.h
+++ b/mini_al.h
@@ -2534,10 +2534,12 @@ static inline mal_uint32 mal_device__get_state(mal_device* pDevice)
 
 
 #ifdef MAL_WIN32
-static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_PCM        = {0x00000001, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
-static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_IEEE_FLOAT = {0x00000003, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
-//static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_ALAW       = {0x00000006, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
-//static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_MULAW      = {0x00000007, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
+    #if !defined(MAL_NO_WASAPI) || !defined(MAL_NO_DSOUND)
+    static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_PCM        = {0x00000001, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
+    static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_IEEE_FLOAT = {0x00000003, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
+    //static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_ALAW       = {0x00000006, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
+    //static GUID MAL_GUID_KSDATAFORMAT_SUBTYPE_MULAW      = {0x00000007, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
+    #endif
 #endif
 
 
@@ -8735,7 +8737,7 @@ mal_result mal_device_init(mal_context* pContext, mal_device_type type, mal_devi
     pDevice->onSend = config.onSendCallback;
     pDevice->onRecv = config.onRecvCallback;
 
-    if (((mal_uint64)pDevice % sizeof(pDevice)) != 0) {
+    if (((size_t)pDevice % sizeof(pDevice)) != 0) {
         if (pContext->config.onLog) {
             pContext->config.onLog(pContext, pDevice, "WARNING: mal_device_init() called for a device that is not properly aligned. Thread safety is not supported.");
         }