diff --git a/src/Makefile b/src/Makefile
index 26c0d199..eee9bdfe 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -129,6 +129,7 @@ DEBUG_TARGETS	+= dbg2.o dbg.o c s
 # SRCDIRS lists all directories containing source files.
 #
 SRCDIRS		+= core
+SRCDIRS		+= proto
 SRCDIRS		+= drivers/bus
 SRCDIRS		+= drivers/net
 #SRCDIRS		+= drivers/disk