diff --git a/net/nanostack-interface/NanostackInterface.cpp b/net/nanostack-interface/NanostackInterface.cpp
index 4b40acc4dc..7aaf1fdc6d 100644
--- a/net/nanostack-interface/NanostackInterface.cpp
+++ b/net/nanostack-interface/NanostackInterface.cpp
@@ -107,8 +107,7 @@ private:
     socket_mode_t mode;
 };
 
-static Semaphore connect_semaphore(0);
-static NanostackSocket * socket_tbl[NS_INTERFACE_SOCKETS_MAX] = {0};
+static NanostackSocket * socket_tbl[NS_INTERFACE_SOCKETS_MAX];
 
 static int map_mesh_error(mesh_error_t err)
 {
diff --git a/net/nanostack-interface/NanostackInterface.h b/net/nanostack-interface/NanostackInterface.h
index 7d747cf63d..051e1024b7 100644
--- a/net/nanostack-interface/NanostackInterface.h
+++ b/net/nanostack-interface/NanostackInterface.h
@@ -13,6 +13,7 @@
 
 class NanostackInterface : public MeshInterface, public NetworkStack {
 public:
+    NanostackInterface() : connect_semaphore(0) { }
     int disconnect();
 
     /** Get the internally stored IP address
@@ -226,6 +227,7 @@ protected:
     uint8_t eui64[8];
     char ip_addr_str[40];
     char mac_addr_str[24];
+    Semaphore connect_semaphore;
 };
 
 class LoWPANNDInterface : public NanostackInterface {