diff --git a/sdk/include/opentelemetry/sdk/common/env_variables.h b/sdk/include/opentelemetry/sdk/common/env_variables.h
index be955ee86a..b1e81e7fd8 100644
--- a/sdk/include/opentelemetry/sdk/common/env_variables.h
+++ b/sdk/include/opentelemetry/sdk/common/env_variables.h
@@ -33,10 +33,10 @@ inline const std::string GetEnvironmentVariable(const char *env_var_name)
   // avoid calling std::getenv which is deprecated in MSVC.
   size_t required_size = 0;
   getenv_s(&required_size, nullptr, 0, env_var_name);
-  std::unique_ptr<char> endpoint_buffer;
+  std::unique_ptr<char[]> endpoint_buffer;
   if (required_size > 0)
   {
-    endpoint_buffer = std::unique_ptr<char>{new char[required_size]};
+    endpoint_buffer = std::unique_ptr<char[]>{new char[required_size]};
     getenv_s(&required_size, endpoint_buffer.get(), required_size, env_var_name);
     endpoint_from_env = endpoint_buffer.get();
   }