diff --git a/reactos/dll/win32/sndblst/sndblst.def b/reactos/dll/win32/sndblst/sndblst.def
deleted file mode 100644
index f1da764ca5f..00000000000
--- a/reactos/dll/win32/sndblst/sndblst.def
+++ /dev/null
@@ -1,15 +0,0 @@
-; $Id: sndblst.def 34299 2008-07-05 02:43:17Z silverblade $
-;
-; sndblst.def
-;
-; ReactOS Operating System
-;
-LIBRARY sndblst.dll
-EXPORTS
-DriverProc@20
-widMessage@20
-wodMessage@20
-midMessage@20
-modMessage@20
-mxdMessage@20
-auxMessage@20
diff --git a/reactos/dll/win32/sndblst/sndblst.rbuild b/reactos/dll/win32/sndblst/sndblst.rbuild
index dc3193187e1..8c4e700c0b8 100644
--- a/reactos/dll/win32/sndblst/sndblst.rbuild
+++ b/reactos/dll/win32/sndblst/sndblst.rbuild
@@ -1,7 +1,7 @@
 <!-- Temporarily compiling as a CUI app for testing purposes */
 <!--module name="mmdrv" type="win32dll" baseaddress="${BASEADDRESS_MMDRV}" installbase="system32" installname="mmdrv.dll" unicode="yes"-->
 <module name="sndblst" type="win32dll" installbase="system32" installname="sndblst.dll" unicode="yes">
-	<importlibrary definition="sndblst.def" />
+	<importlibrary definition="sndblst.spec" />
     <include base="ReactOS">include/reactos/libs/sound</include>
 	<include base="sndblst">.</include>
 	<define name="DEBUG_NT4" />
diff --git a/reactos/dll/win32/sndblst/sndblst.spec b/reactos/dll/win32/sndblst/sndblst.spec
new file mode 100644
index 00000000000..67e8812c9a7
--- /dev/null
+++ b/reactos/dll/win32/sndblst/sndblst.spec
@@ -0,0 +1,7 @@
+@ stdcall DriverProc(long ptr long long long)
+@ stdcall widMessage(long long long long long)
+@ stdcall wodMessage(long long long long long)
+@ stdcall midMessage(long long long long long)
+@ stdcall modMessage(long long long long long)
+@ stdcall mxdMessage(long long long long long)
+@ stdcall auxMessage(long long long long long)