diff --git a/.cargo/release-windows-ms.toml b/.cargo/release-windows-ms.toml
index 0e5f50a..cd55659 100644
--- a/.cargo/release-windows-ms.toml
+++ b/.cargo/release-windows-ms.toml
@@ -16,7 +16,7 @@ rustflags = [
 # = Huge reduction in binary size by removing all that.
 [unstable]
 build-std = ["std", "panic_abort"]
-build-std-features = ["panic_immediate_abort"]
+build-std-features = ["panic_immediate_abort", "optimize_for_size"]
 
 # vvv The following parts are specific to official Windows builds. vvv
 # (The use of internal registries, security features, etc., are mandatory.)
diff --git a/.cargo/release.toml b/.cargo/release.toml
index 5d665c6..55bf615 100644
--- a/.cargo/release.toml
+++ b/.cargo/release.toml
@@ -20,4 +20,4 @@ rustflags = [
 # = Huge reduction in binary size by removing all that.
 [unstable]
 build-std = ["std", "panic_abort"]
-build-std-features = ["panic_immediate_abort"]
+build-std-features = ["panic_immediate_abort", "optimize_for_size"]