diff --git a/build_msvc/libsecp256k1_config.h b/build_msvc/libsecp256k1_config.h
index 5187c946a0..5978b9a0d9 100644
--- a/build_msvc/libsecp256k1_config.h
+++ b/build_msvc/libsecp256k1_config.h
@@ -26,4 +26,7 @@
 #define USE_FIELD_10X26 1
 #define USE_SCALAR_8X32 1
 
+#define ECMULT_GEN_PREC_BITS 4
+#define ECMULT_WINDOW_SIZE 15
+
 #endif /* BITCOIN_LIBSECP256K1_CONFIG_H */