diff --git a/optimum/intel/openvino/quantization.py b/optimum/intel/openvino/quantization.py
index e89fa9b449..fa169ff547 100644
--- a/optimum/intel/openvino/quantization.py
+++ b/optimum/intel/openvino/quantization.py
@@ -1085,7 +1085,7 @@ def _full_quantization(
     quantized_model = nncf.quantize(
         model,
         calibration_dataset,
-        subset_size=quantization_config.num_samples,
+        subset_size=quantization_config.num_samples if quantization_config.num_samples else 128,
         ignored_scope=quantization_config.get_ignored_scope_instance(),
         model_type=nncf.ModelType(quantization_config.model_type),
         preset=nncf.QuantizationPreset.PERFORMANCE if quantization_config.sym else nncf.QuantizationPreset.MIXED,
diff --git a/tests/openvino/test_exporters_cli.py b/tests/openvino/test_exporters_cli.py
index 7c64d84d3d..6d1bf5eb5e 100644
--- a/tests/openvino/test_exporters_cli.py
+++ b/tests/openvino/test_exporters_cli.py
@@ -127,7 +127,7 @@ class OVCLIExportTestCase(unittest.TestCase):
             "text-generation",
             "llama",
             "f8e4m3",
-            "--dataset wikitext2 --num-samples 1 --smooth-quant-alpha 0.9 --trust-remote-code",
+            "--dataset wikitext2 --smooth-quant-alpha 0.9 --trust-remote-code",
             (13,),
             (16,),
         ),