diff --git a/Cargo.toml b/Cargo.toml
index 84b96a329140..26b4af2e0a1e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -62,3 +62,7 @@ rustc_tools_util = { version = "0.2.0", path = "rustc_tools_util"}
 [features]
 deny-warnings = []
 integration = ["git2", "tempfile"]
+
+# Reduce build time by setting proc-macro crates non optimized.
+[profile.release.build-override]
+opt-level = 0
diff --git a/clippy_dummy/Cargo.toml b/clippy_dummy/Cargo.toml
index 7b11795fafdc..6de29759bdfa 100644
--- a/clippy_dummy/Cargo.toml
+++ b/clippy_dummy/Cargo.toml
@@ -15,3 +15,7 @@ categories = ["development-tools", "development-tools::cargo-plugins"]
 
 [build-dependencies]
 term = "0.6"
+
+# Reduce build time by setting proc-macro crates non optimized.
+[profile.release.build-override]
+opt-level = 0