diff --git a/reactos/include/psdk/ksmedia.h b/reactos/include/psdk/ksmedia.h
index 3c91a72fa9e..edfb9e14a80 100644
--- a/reactos/include/psdk/ksmedia.h
+++ b/reactos/include/psdk/ksmedia.h
@@ -300,6 +300,9 @@ DEFINE_GUIDSTRUCT("47A4FA20-A251-11D1-A050-0000F8004788", KSCATEGORY_WDMAUD_USE_
 */
 
 //#if defined(_INC_MMREG)
+#if !defined( PACK_PRAGMAS_NOT_SUPPORTED )
+#include <pshpack1.h>
+#endif
 typedef struct {
     KSDATAFORMAT    DataFormat;
     WAVEFORMATEX    WaveFormatEx;
@@ -316,6 +319,10 @@ typedef struct {
     KSDSOUND_BUFFERDESC BufferDesc;
 } KSDATAFORMAT_DSOUND, *PKSDATAFORMAT_DSOUND;
 
+#if !defined( PACK_PRAGMAS_NOT_SUPPORTED )
+#include <poppack.h>
+#endif
+
 //#endif
 
 typedef struct {