diff --git a/Makefile.am b/Makefile.am
index 047b2f21..29b8a69c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -227,7 +227,7 @@ TESTVECTORS = src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h
 
 src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h:
 	mkdir -p $(@D)
-	python3 tools/tests_wycheproof_generate.py src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json > $@
+	python3 $(top_srcdir)/tools/tests_wycheproof_generate.py $(top_srcdir)/src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json > $@
 
 testvectors: $(TESTVECTORS)