diff --git a/src/util/time.h b/src/util/time.h
--- a/src/util/time.h
+++ b/src/util/time.h
@@ -10,6 +10,8 @@
 #include <cstdint>
 #include <string>
 
+void UninterruptibleSleep(const std::chrono::microseconds &n);
+
 /**
  * DEPRECATED
  * Use either GetSystemTimeInSeconds (not mockable) or GetTime<T> (mockable)
diff --git a/src/util/time.cpp b/src/util/time.cpp
--- a/src/util/time.cpp
+++ b/src/util/time.cpp
@@ -16,6 +16,11 @@
 
 #include <atomic>
 #include <ctime>
+#include <thread>
+
+void UninterruptibleSleep(const std::chrono::microseconds &n) {
+    std::this_thread::sleep_for(n);
+}
 
 //! For unit testing
 static std::atomic<int64_t> nMockTime(0);