diff --git a/tests/test_qasm_quimb_backend.py b/tests/test_qasm_quimb_backend.py
index d9e3cf9..ba99dcb 100644
--- a/tests/test_qasm_quimb_backend.py
+++ b/tests/test_qasm_quimb_backend.py
@@ -1,9 +1,12 @@
-import pytest
+import os
 
-from qibotn import qasm_quimb
+import pytest
 
 
 @pytest.mark.parametrize("nqubits", [1, 2, 5, 10])
 def test_eval(nqubits: int):
+    os.environ["QUIMB_NUM_PROCS"] = str(os.cpu_count())
+    from qibotn import qasm_quimb
+
     print(f"Testing for {nqubits} nqubits")
     result = qasm_quimb.eval_QI_qft(nqubits)