diff --git a/flake.nix b/flake.nix
index abe6e55..fbdb2e2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,6 +21,7 @@
         };
         rust-toolchain = fenix.packages."${system}".stable.defaultToolchain;
         rust-analyzer = fenix.packages."${system}".stable.rust-analyzer;
+        rust-src = fenix.packages."${system}".stable.rust-src;
         naersk-lib = naersk.lib.${system}.override {
           cargo = rust-toolchain;
           rustc = rust-toolchain;
@@ -42,6 +43,9 @@
               rust-analyzer
               rust-toolchain
             ];
+            shellHook = ''
+              export RUST_SRC_PATH="${rust-src}/lib/rustlib/src/rust/library"
+            '';
           };
         }
     );