diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/trace/sampling.py b/opentelemetry-sdk/src/opentelemetry/sdk/trace/sampling.py
index 40e142ea1a9..f3f9bf850f1 100644
--- a/opentelemetry-sdk/src/opentelemetry/sdk/trace/sampling.py
+++ b/opentelemetry-sdk/src/opentelemetry/sdk/trace/sampling.py
@@ -121,7 +121,7 @@ def __init__(rate):
     # ...
     class CustomSamplerFactory:
         @staticmethod
-        get_sampler(sampler_argument):
+        def get_sampler(sampler_argument):
             try:
                 rate = float(sampler_argument)
                 return CustomSampler(rate)