diff --git a/Cargo.toml b/Cargo.toml
index 7d86799..42ad909 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -79,6 +79,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [profile.release]
 lto = true
+codegen-units = 1
 
 [[test]]
 name = "integration"