diff --git a/Makefile.am b/Makefile.am
index 9af8eff9a3c50..36e26e3e8a47f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -255,8 +255,8 @@ EXTRA_DIST += tools/tests_wycheproof_generate.py
 
 TESTVECTORS = src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h
 
-src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h: src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json
-	python3 tools/tests_wycheproof_generate.py $< > $@
+src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h:
+	python3 tools/tests_wycheproof_generate.py src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json > $@
 
 testvectors: $(TESTVECTORS)