diff --git a/libmysql_r/Makefile.am b/libmysql_r/Makefile.am
index 2ff4082b014..4a37dcfdec9 100644
--- a/libmysql_r/Makefile.am
+++ b/libmysql_r/Makefile.am
@@ -41,6 +41,7 @@ link_sources:
 	    @LN_CP_F@ $$d/$$f $$f; \
 	  done; \
 	done
+	echo timestamp > link_sources
 
 # Don't update the files from bitkeeper
 %::SCCS/s.%
diff --git a/sql/Makefile.am b/sql/Makefile.am
index f3e2484f9ab..0081417d492 100644
--- a/sql/Makefile.am
+++ b/sql/Makefile.am
@@ -161,6 +161,7 @@ link_sources:
 	@LN_CP_F@ $(top_srcdir)/sql-common/my_time.c my_time.c
 	rm -f my_user.c
 	@LN_CP_F@ $(top_srcdir)/sql-common/my_user.c my_user.c
+	echo timestamp > link_sources
 
 # This generates lex_hash.h
 # NOTE Built sources should depend on their sources not the tool