diff --git a/accumulator.cpp b/accumulator.cpp
index 6a623bc..a85deb3 100644
--- a/accumulator.cpp
+++ b/accumulator.cpp
@@ -8,6 +8,7 @@
 
 #include <algorithm>
 #include <array>
+#include <atomic>
 #include <chrono>
 #include <cstdint>
 #include <memory>
@@ -54,7 +55,7 @@ auto Accumulator::_p_pools_equal(
 
 // check if given source id is an id of an already registered entropy source
 auto Accumulator::src_is_registered(const uint8_t& id) -> bool {
-	bool reg{false};
+	std::atomic<bool> reg{false};
 	static uint8_t _src_id{};
 
 	if (std::any_of(this->entropy_sources.begin(),