diff --git a/dlls/msvfw32/msvfw32.spec b/dlls/msvfw32/msvfw32.spec
index 3fdd2f63eea..f0c9e157fd0 100644
--- a/dlls/msvfw32/msvfw32.spec
+++ b/dlls/msvfw32/msvfw32.spec
@@ -34,13 +34,13 @@
 @ stdcall ICImageCompress(long long ptr ptr ptr long ptr)
 @ stdcall ICImageDecompress(long long ptr ptr ptr)
 @ stdcall ICInfo(long long ptr)
-@ stdcall ICInstall(long long ptr str long)
+@ stdcall ICInstall(long long long str long)
 @ stdcall ICLocate(long long ptr ptr long)
 @ stub    ICMThunk
 @ stdcall ICOpen(long long long)
 @ stdcall ICOpenFunction(long long long ptr)
 @ stdcall ICRemove(long long long)
-@ stdcall ICSendMessage(long long ptr ptr)
+@ stdcall ICSendMessage(long long long long)
 @ stdcall ICSeqCompressFrame(ptr long ptr ptr ptr)
 @ stdcall ICSeqCompressFrameEnd(ptr)
 @ stdcall ICSeqCompressFrameStart(ptr ptr)