diff --git a/dlls/winaspi/aspi.c b/dlls/winaspi/aspi.c
index dae42fa5d73..8c20de1e0cd 100644
--- a/dlls/winaspi/aspi.c
+++ b/dlls/winaspi/aspi.c
@@ -144,6 +144,7 @@ SCSI_OpenDevice( int h, int c, int t, int d )
 	return fd;
 }
 
+#ifdef linux
 int
 SCSI_LinuxSetTimeout( int fd, int timeout )
 {
@@ -344,4 +345,4 @@ SCSI_GetProcinfo()
 	RegCloseKey(hkeyScsi);
 	return;
 }
-
+#endif
diff --git a/dlls/winaspi/winescsi.h b/dlls/winaspi/winescsi.h
index f2fa44956ea..0ef40ed5c51 100644
--- a/dlls/winaspi/winescsi.h
+++ b/dlls/winaspi/winescsi.h
@@ -47,11 +47,13 @@ SCSI_OpenDevice( int h, int c, int t, int d );
 int
 SCSI_LinuxSetTimeout( int fd, int timeout );
 
+#ifdef linux
 BOOL
 SCSI_LinuxDeviceIo( int fd,
 		struct sg_header * lpvInBuffer, DWORD cbInBuffer,
 		struct sg_header * lpvOutBuffer, DWORD cbOutBuffer,
 		LPDWORD lpcbBytesReturned );
+#endif
 
 BOOL
 SCSI_GetDeviceName(int h, int c, int t, int d, LPSTR devstr, LPDWORD lpcbData);