diff --git a/crates/guest-rust/rt/src/lib.rs b/crates/guest-rust/rt/src/lib.rs
index 7bf4c2c0d..e84934ed8 100644
--- a/crates/guest-rust/rt/src/lib.rs
+++ b/crates/guest-rust/rt/src/lib.rs
@@ -1,3 +1,5 @@
+#![no_std]
+
 extern crate alloc;
 
 /// For more information about this see `./ci/rebuild-libcabi-realloc.sh`.