diff --git a/packages/taler-harness/Makefile b/packages/taler-harness/Makefile
index 85c146641..8bbca5831 100644
--- a/packages/taler-harness/Makefile
+++ b/packages/taler-harness/Makefile
@@ -18,6 +18,7 @@ install_target = $(prefix)/lib/taler-harness
 .PHONY: install install-nodeps
 install:
 	pnpm install --frozen-lockfile --filter @gnu-taler/taler-harness...
+	./build.mjs
 	install -d $(prefix)/bin
 	install -d $(install_target)/bin
 	install -d $(install_target)/node_modules/taler-harness