diff --git a/Cargo.lock b/Cargo.lock
index 57cc51f2ae1..bdba69d5f51 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -254,7 +254,7 @@ dependencies = [
 
 [[package]]
 name = "build-rs"
-version = "0.2.0"
+version = "0.3.0"
 dependencies = [
  "unicode-ident",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 915fb30cef0..8e676d2984d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ anstyle = "1.0.8"
 anyhow = "1.0.86"
 base64 = "0.22.1"
 blake3 = "1.5.2"
-build-rs = { version = "0.2.0", path = "crates/build-rs" }
+build-rs = { version = "0.3.0", path = "crates/build-rs" }
 bytesize = "1.3"
 cargo = { path = "" }
 cargo-credential = { version = "0.4.2", path = "credential/cargo-credential" }
diff --git a/crates/build-rs-test-lib/build.rs b/crates/build-rs-test-lib/build.rs
index 1167a34907e..eff04806a73 100644
--- a/crates/build-rs-test-lib/build.rs
+++ b/crates/build-rs-test-lib/build.rs
@@ -10,7 +10,6 @@ fn smoke_test_inputs() {
     use build_rs::input::*;
     dbg!(cargo());
     dbg!(cargo_cfg("careful"));
-    dbg!(cargo_cfg_debug_assertions());
     #[cfg(feature = "unstable")]
     dbg!(cargo_cfg_fmt_debug());
     #[cfg(feature = "unstable")]
diff --git a/crates/build-rs/Cargo.toml b/crates/build-rs/Cargo.toml
index e2e8eb9fccf..24e42b09863 100644
--- a/crates/build-rs/Cargo.toml
+++ b/crates/build-rs/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "build-rs"
-version = "0.2.0"
+version = "0.3.0"
 rust-version.workspace = true
 edition.workspace = true
 license.workspace = true
diff --git a/crates/build-rs/src/input.rs b/crates/build-rs/src/input.rs
index 6f564f8c68b..112aa5fed4e 100644
--- a/crates/build-rs/src/input.rs
+++ b/crates/build-rs/src/input.rs
@@ -109,6 +109,11 @@ mod cfg {
     }
 
     /// If we are compiling with debug assertions enabled.
+    ///
+    /// Build scripts are not passed this cfg because
+    /// this cfg is always true and misleading.
+    /// That is because Cargo queries rustc without any profile settings.
+    #[cfg(any())]
     #[track_caller]
     pub fn cargo_cfg_debug_assertions() -> bool {
         is_present("CARGO_CFG_DEBUG_ASSERTIONS")