diff --git a/libraries/ESPmDNS/src/ESPmDNS.h b/libraries/ESPmDNS/src/ESPmDNS.h
index 74f9002461f..1fb90bbf454 100644
--- a/libraries/ESPmDNS/src/ESPmDNS.h
+++ b/libraries/ESPmDNS/src/ESPmDNS.h
@@ -127,9 +127,7 @@ class MDNSResponder {
   mdns_txt_item_t *_getResultTxt(int idx, int txtIdx);
 };
 
-#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_MDNS)
 extern MDNSResponder MDNS;
-#endif
 
 #endif  /* CONFIG_MDNS_MAX_INTERFACES */
 #endif  //ESP32MDNS_H
diff --git a/libraries/Ethernet/src/ETH.cpp b/libraries/Ethernet/src/ETH.cpp
index 17b5da6d515..a8546c66131 100644
--- a/libraries/Ethernet/src/ETH.cpp
+++ b/libraries/Ethernet/src/ETH.cpp
@@ -1174,6 +1174,8 @@ size_t ETHClass::printDriverInfo(Print &out) const {
   return bytes;
 }
 
+#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_ETH)
 ETHClass ETH;
+#endif
 
 #endif /* CONFIG_ETH_ENABLED */
diff --git a/libraries/Network/src/NetworkManager.h b/libraries/Network/src/NetworkManager.h
index dafac9cd983..6b9d5e16cfc 100644
--- a/libraries/Network/src/NetworkManager.h
+++ b/libraries/Network/src/NetworkManager.h
@@ -31,6 +31,4 @@ class NetworkManager : public NetworkEvents, public Printable {
   }
 };
 
-#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_NETWORK)
 extern NetworkManager Network;
-#endif
diff --git a/libraries/PPP/src/PPP.cpp b/libraries/PPP/src/PPP.cpp
index 2a5c5760287..5e713bc84b0 100644
--- a/libraries/PPP/src/PPP.cpp
+++ b/libraries/PPP/src/PPP.cpp
@@ -763,6 +763,8 @@ size_t PPPClass::printDriverInfo(Print &out) const {
   return bytes;
 }
 
+#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_PPP)
 PPPClass PPP;
+#endif
 
 #endif /* CONFIG_LWIP_PPP_SUPPORT */
diff --git a/libraries/WiFi/src/WiFi.h b/libraries/WiFi/src/WiFi.h
index 6cfeb1155a0..ea2efd97697 100644
--- a/libraries/WiFi/src/WiFi.h
+++ b/libraries/WiFi/src/WiFi.h
@@ -72,8 +72,6 @@ class WiFiClass : public WiFiGenericClass, public WiFiSTAClass, public WiFiScanC
   bool isProvEnabled();
 };
 
-#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_WIFI)
 extern WiFiClass WiFi;
-#endif
 
 #endif /* SOC_WIFI_SUPPORTED */