diff --git a/net/Socket.cpp b/net/Socket.cpp
index 31ad77c6c..1bf847cba 100644
--- a/net/Socket.cpp
+++ b/net/Socket.cpp
@@ -143,6 +143,9 @@ void SocketDisposition::execute()
     _socketMove = nullptr;
 }
 
+const int WebSocketHandler::InitialPingDelayMs = 25;
+const int WebSocketHandler::PingFrequencyMs = 18 * 1000;
+
 void WebSocketHandler::dumpState(std::ostream& os)
 {
     os << (_shuttingDown ? "shutd " : "alive ")
diff --git a/net/WebSocketHandler.hpp b/net/WebSocketHandler.hpp
index d981ab4df..b363364fd 100644
--- a/net/WebSocketHandler.hpp
+++ b/net/WebSocketHandler.hpp
@@ -40,8 +40,8 @@ protected:
         static const unsigned char Mask = 0x80;
     };
 
-    static const int InitialPingDelayMs = 25;
-    static const int PingFrequencyMs = 18 * 1000;
+    static const int InitialPingDelayMs;
+    static const int PingFrequencyMs;
 
 public:
     WebSocketHandler() :
diff --git a/wsd/Admin.cpp b/wsd/Admin.cpp
index 8add69566..41407d071 100644
--- a/wsd/Admin.cpp
+++ b/wsd/Admin.cpp
@@ -44,6 +44,9 @@ using Poco::Net::HTTPResponse;
 using Poco::StringTokenizer;
 using Poco::Util::Application;
 
+const int Admin::MinStatsIntervalMs = 50;
+const int Admin::DefStatsIntervalMs = 2500;
+
 /// Process incoming websocket messages
 void AdminSocketHandler::handleMessage(bool /* fin */, WSOpCode /* code */,
                                        std::vector<char> &payload)
diff --git a/wsd/Admin.hpp b/wsd/Admin.hpp
index e3386952b..571979401 100644
--- a/wsd/Admin.hpp
+++ b/wsd/Admin.hpp
@@ -153,8 +153,8 @@ private:
     DocProcSettings _defDocProcSettings;
 
     // Don't update any more frequently than this since it's excessive.
-    static const int MinStatsIntervalMs = 50;
-    static const int DefStatsIntervalMs = 2500;
+    static const int MinStatsIntervalMs;
+    static const int DefStatsIntervalMs;
 };
 
 #endif