diff --git a/.gitignore b/.gitignore
index 1dc7a8f..0658437 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,6 @@ Cargo.lock
 #IntelliJ project files
 .idea
 *.iml
+
+CMakeLists.txt
+cmake-build-debug
diff --git a/build.rs b/build.rs
index 664af17..18fe385 100644
--- a/build.rs
+++ b/build.rs
@@ -52,7 +52,8 @@ fn main() {
                .define("USE_NUM_NONE", Some("1"))
                .define("USE_FIELD_INV_BUILTIN", Some("1"))
                .define("USE_SCALAR_INV_BUILTIN", Some("1"))
-               .define("ENABLE_MODULE_ECDH", Some("1"));
+               .define("ENABLE_MODULE_ECDH", Some("1"))
+               .define("ECMULT_WINDOW_SIZE", Some("15")); // This is the default in the configure file (`auto`)
 
     #[cfg(feature = "endomorphism")]
     base_config.define("USE_ENDOMORPHISM", Some("1"));