diff --git a/testing/tests/server_main_process_contract.rs b/testing/tests/server_main_process_contract.rs
index 7a9f145..ffd6d37 100644
--- a/testing/tests/server_main_process_contract.rs
+++ b/testing/tests/server_main_process_contract.rs
@@ -50,11 +50,18 @@ fn build_current_binary(name: &str) -> Option<PathBuf> {
     }
     let cargo = option_env!("CARGO").unwrap_or("cargo");
     let target_dir = workspace_root().join("target/process-contract-debug");
+    let _ = fs::remove_dir_all(&target_dir);
     let mut command = Command::new(cargo);
     let status = command
         .current_dir(workspace_root())
+        .env_remove("CARGO_BUILD_RUSTFLAGS")
         .env_remove("CARGO_ENCODED_RUSTFLAGS")
+        .env_remove("CARGO_LLVM_COV")
+        .env_remove("CARGO_LLVM_COV_TARGET_DIR")
+        .env_remove("CARGO_TARGET_DIR")
+        .env_remove("LLVM_COV")
         .env_remove("RUSTFLAGS")
+        .env_remove("RUSTDOCFLAGS")
         .env_remove("LLVM_PROFILE_FILE")
         .arg("build")
         .arg("--target-dir")