diff --git a/guests/eth-block/Cargo.toml b/guests/eth-block/Cargo.toml
index 98611727..254ba716 100644
--- a/guests/eth-block/Cargo.toml
+++ b/guests/eth-block/Cargo.toml
@@ -20,3 +20,4 @@ sha2 = { git = "https://github.com/risc0/RustCrypto-hashes", tag = "sha2-v0.10.6
 [profile.release]
 codegen-units = 1
 panic = "abort"
+lto = "thin"
diff --git a/guests/op-block/Cargo.toml b/guests/op-block/Cargo.toml
index 60e1039d..255c33ae 100644
--- a/guests/op-block/Cargo.toml
+++ b/guests/op-block/Cargo.toml
@@ -20,3 +20,4 @@ sha2 = { git = "https://github.com/risc0/RustCrypto-hashes", tag = "sha2/v0.10.6
 [profile.release]
 codegen-units = 1
 panic = "abort"
+lto = "thin"