diff --git a/common/Logger.cpp b/common/Logger.cpp
index e48564d7a..cccee71f4 100644
--- a/common/Logger.cpp
+++ b/common/Logger.cpp
@@ -7,6 +7,7 @@
 #include "spdlog/fmt/bin_to_hex.h"
 
 #include <map>
+#include <set>
 
 #include "Logger.h"
 #include "GitInfo.h"
@@ -64,6 +65,15 @@ Logger::Logger(const std::string &service_name, const std::string &file_name) {
     spdlog_logger = std::make_shared<spdlog::logger>(service_name, std::begin(sinks), std::end(sinks));
     if (const auto it = service_levels.find(service_name); it != service_levels.end())
         spdlog_logger->set_level(it->second);
+    {
+        // The version line goes out once per service: a run makes many loggers of one service (every FFT indexer
+        // is one). Function-local, as a static Logger (jfjoch_writer's) is made before this file's own statics.
+        static std::mutex version_mutex;
+        static std::set<std::string> version_logged;
+        std::unique_lock ul(version_mutex);
+        if (!version_logged.insert(service_name).second)
+            return;
+    }
     if (jfjoch_git_sha1().empty())
         spdlog_logger->info("Version {} {}", jfjoch_version(), variant);
     else