diff --git a/pkgs/development/tools/rust/rust-analyzer/default.nix b/pkgs/development/tools/rust/rust-analyzer/default.nix
index 91eea15867e9..7e69f18e124f 100644
--- a/pkgs/development/tools/rust/rust-analyzer/default.nix
+++ b/pkgs/development/tools/rust/rust-analyzer/default.nix
@@ -56,9 +56,6 @@ rustPlatform.buildRustPackage rec {
 
   buildAndTestSubdir = "crates/rust-analyzer";
 
-  cargoBuildFlags = lib.optional useMimalloc "--features=mimalloc";
-  cargoTestFlags = lib.optional useMimalloc "--features=mimalloc";
-
   nativeBuildInputs = lib.optional useMimalloc cmake;
 
   buildInputs = lib.optionals stdenv.isDarwin [
@@ -66,6 +63,8 @@ rustPlatform.buildRustPackage rec {
     libiconv
   ];
 
+  buildFeatures = lib.optional useMimalloc "mimalloc";
+
   RUST_ANALYZER_REV = version;
 
   inherit doCheck;