diff --git a/src/mesa/pipe/softpipe/sp_winsys.h b/src/mesa/pipe/softpipe/sp_winsys.h
index cbf64ebb850..d6b379f58c6 100644
--- a/src/mesa/pipe/softpipe/sp_winsys.h
+++ b/src/mesa/pipe/softpipe/sp_winsys.h
@@ -37,6 +37,7 @@
 
 #include "pipe/p_compiler.h" /* for boolean */
 
+enum pipe_format;
 
 struct softpipe_winsys {
    /** test if the given format is supported for front/back color bufs */