diff --git a/tests/v1/sample/test_logprobs.py b/tests/v1/sample/test_logprobs.py
index 42584938bc06..7f421a757cc2 100644
--- a/tests/v1/sample/test_logprobs.py
+++ b/tests/v1/sample/test_logprobs.py
@@ -556,6 +556,7 @@ def test_spec_decode_logprobs(
         seed=42,
         logprobs_mode=logprobs_mode,
         gpu_memory_utilization=0.4,
+        dtype=DTYPE,
     )
     ref_results = ref_llm.generate([prompt], sampling_params)
     # Collect logprobs outputs from reference LLM.
@@ -582,6 +583,7 @@ def test_spec_decode_logprobs(
         seed=42,
         logprobs_mode=logprobs_mode,
         gpu_memory_utilization=0.4,
+        dtype=DTYPE,
     )
     spec_results = spec_llm.generate([prompt], sampling_params)
     # Collect logprobs outputs from spec decode LLM.