diff --git a/crates/ra_lsp_server/src/project_model/sysroot.rs b/crates/ra_lsp_server/src/project_model/sysroot.rs
index 3b2fa070b2e..1e0604bf527 100644
--- a/crates/ra_lsp_server/src/project_model/sysroot.rs
+++ b/crates/ra_lsp_server/src/project_model/sysroot.rs
@@ -129,6 +129,7 @@ syntax";
 const STD_DEPS: &str = "
 alloc_jemalloc
 alloc_system
+core
 panic_abort
 rand
 compiler_builtins