diff --git a/Cargo.toml b/Cargo.toml
index 61870bb88..25b490bb1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,3 +20,4 @@ lto = true
 # Optimize quote even in debug mode. Speeds up proc-macros enough to account
 # for the extra time of optimizing it for a clean build of matrix-sdk-ffi.
 quote = { opt-level = 2 }
+sha2 = { opt-level = 2 }