diff --git a/dlls/dsound/dsound.spec b/dlls/dsound/dsound.spec
index 09123e9a7a0..ca8c7809b95 100644
--- a/dlls/dsound/dsound.spec
+++ b/dlls/dsound/dsound.spec
@@ -7,6 +7,6 @@
 7 stdcall DirectSoundCaptureEnumerateA(ptr ptr)
 8 stdcall DirectSoundCaptureEnumerateW(ptr ptr)
 9 stdcall GetDeviceID(ptr ptr)
-10 stub DirectSoundFullDuplexCreate
+10 stdcall DirectSoundFullDuplexCreate8(ptr ptr ptr ptr long long ptr ptr ptr ptr) DirectSoundFullDuplexCreate
 11 stdcall DirectSoundCreate8(ptr ptr ptr)
 12 stdcall DirectSoundCaptureCreate8(ptr ptr ptr)