diff --git a/libsrc/core/paje_trace.hpp b/libsrc/core/paje_trace.hpp
index d2584487..83c66bab 100644
--- a/libsrc/core/paje_trace.hpp
+++ b/libsrc/core/paje_trace.hpp
@@ -22,8 +22,8 @@ namespace ngcore
       std::shared_ptr<spdlog::logger> logger = GetLogger("PajeTrace");
     private:
       NGCORE_API static size_t max_tracefile_size;
-      static bool trace_thread_counter;
-      static bool trace_threads;
+      NGCORE_API static bool trace_thread_counter;
+      NGCORE_API static bool trace_threads;
 
       bool tracing_enabled;
       TTimePoint start_time;
@@ -107,8 +107,8 @@ namespace ngcore
       PajeTrace() = delete;
       PajeTrace(const PajeTrace &) = delete;
       PajeTrace(PajeTrace &&) = delete;
-      PajeTrace(int anthreads, std::string aname = "");
-      ~PajeTrace();
+      NGCORE_API PajeTrace(int anthreads, std::string aname = "");
+      NGCORE_API ~PajeTrace();
 
       void operator=(const PajeTrace &) = delete;
       void operator=(PajeTrace &&) = delete;
diff --git a/libsrc/core/profiler.cpp b/libsrc/core/profiler.cpp
index e24de4e3..f738fd55 100644
--- a/libsrc/core/profiler.cpp
+++ b/libsrc/core/profiler.cpp
@@ -8,10 +8,10 @@ namespace ngcore
 
   std::string NgProfiler::filename;
 
-  size_t dummy_thread_times[NgProfiler::SIZE];
-  size_t * NgProfiler::thread_times = dummy_thread_times; // NOLINT
-  size_t dummy_thread_flops[NgProfiler::SIZE];
-  size_t * NgProfiler::thread_flops = dummy_thread_flops; // NOLINT
+  size_t NgProfiler::dummy_thread_times[NgProfiler::SIZE];
+  size_t * NgProfiler::thread_times = NgProfiler::dummy_thread_times; // NOLINT
+  size_t NgProfiler::dummy_thread_flops[NgProfiler::SIZE];
+  size_t * NgProfiler::thread_flops = NgProfiler::dummy_thread_flops; // NOLINT
 
   std::shared_ptr<spdlog::logger> NgProfiler::logger = GetLogger("Profiler"); // NOLINT
 
diff --git a/libsrc/core/profiler.hpp b/libsrc/core/profiler.hpp
index 10a5cf0d..f7415881 100644
--- a/libsrc/core/profiler.hpp
+++ b/libsrc/core/profiler.hpp
@@ -35,9 +35,11 @@ namespace ngcore
     NGCORE_API static TTimePoint * thread_times;
     NGCORE_API static TTimePoint * thread_flops;
     NGCORE_API static std::shared_ptr<spdlog::logger> logger;
+    NGCORE_API static size_t dummy_thread_times[NgProfiler::SIZE];
+    NGCORE_API static size_t dummy_thread_flops[NgProfiler::SIZE];
   private:
 
-    static std::string filename;
+    NGCORE_API static std::string filename;
   public:
     NgProfiler();
     ~NgProfiler();
@@ -143,7 +145,7 @@ namespace ngcore
 
 
 
-  class Timer
+  class NGCORE_API Timer
   {
     int timernr;
     int priority;