diff --git a/src/mesa/drivers/dri/intel_winsys/Makefile b/src/mesa/drivers/dri/intel_winsys/Makefile
index aca31f712d0..7c37812172b 100644
--- a/src/mesa/drivers/dri/intel_winsys/Makefile
+++ b/src/mesa/drivers/dri/intel_winsys/Makefile
@@ -17,6 +17,7 @@ DRIVER_SOURCES = \
 	intel_batchbuffer.c \
 	intel_buffers.c \
 	intel_context.c \
+	intel_lock.c \
 	intel_screen.c \
 	intel_batchpool.c