diff --git a/src/StateFileConfig.cxx b/src/StateFileConfig.cxx
index f02fdc552..c59d9f387 100644
--- a/src/StateFileConfig.cxx
+++ b/src/StateFileConfig.cxx
@@ -24,8 +24,6 @@
 #include "fs/StandardDirectory.hxx"
 #endif
 
-constexpr std::chrono::steady_clock::duration StateFileConfig::DEFAULT_INTERVAL;
-
 StateFileConfig::StateFileConfig(const ConfigData &config)
 	:path(config.GetPath(ConfigOption::STATE_FILE)),
 	 interval(config.GetUnsigned(ConfigOption::STATE_FILE_INTERVAL,
diff --git a/src/lib/nfs/Blocking.cxx b/src/lib/nfs/Blocking.cxx
index fecc6d628..78fdb9dfd 100644
--- a/src/lib/nfs/Blocking.cxx
+++ b/src/lib/nfs/Blocking.cxx
@@ -21,8 +21,6 @@
 #include "Connection.hxx"
 #include "event/Call.hxx"
 
-constexpr std::chrono::steady_clock::duration BlockingNfsOperation::timeout;
-
 void
 BlockingNfsOperation::Run()
 {