diff --git a/inc/etherdefs.h b/inc/etherdefs.h
index b81cb52..013984d 100644
--- a/inc/etherdefs.h
+++ b/inc/etherdefs.h
@@ -19,5 +19,5 @@ void setNethubHost(char* host);
 void setNethubPort(int port);
 void setNethubMac(int m0, int m1, int m2, int m3, int m4, int m5);
 void setNethubLogLevel(int ll);
-void connectToHub();
+void connectToHub(void);
 #endif
diff --git a/src/ether_nethub.c b/src/ether_nethub.c
index 672d358..63ca502 100644
--- a/src/ether_nethub.c
+++ b/src/ether_nethub.c
@@ -131,7 +131,7 @@ static void dblwordsSwap(u_char* basePtr, int forBytes) {
 **  --- connect, disconnect and transmit packets -----------------------------------
 */
 
-void connectToHub() {
+void connectToHub(void) {
   if (nethubHost == NULL) {
     return;
   }