diff --git a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
index ff04ba6a817..7630c6471dc 100644
--- a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
+++ b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
@@ -73,6 +73,7 @@ in ''
   export CARGO_PKG_VERSION_PATCH=${builtins.elemAt version 2}
   export NUM_JOBS=1
   export RUSTC="rustc"
+  export RUSTDOC="rustdoc"
   if [[ -n "${versionPre}" ]]; then
     export CARGO_PKG_VERSION_PRE="${versionPre}"
   fi