diff --git a/src/settings.cpp b/src/settings.cpp
index 73606af18d..648c4c2fa9 100644
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -1523,6 +1523,7 @@ void SetDefaultCompanySettings(CompanyID cid)
 	}
 }
 
+#if defined(ENABLE_NETWORK)
 /**
  * Sync all company settings in a multiplayer game.
  */
@@ -1538,6 +1539,7 @@ void SyncCompanySettings()
 		if (old_value != new_value) NetworkSend_Command(0, i, new_value, CMD_CHANGE_COMPANY_SETTING, NULL, NULL);
 	}
 }
+#endif /* ENABLE_NETWORK */
 
 /**
  * Get the index in the _company_settings array of a setting
diff --git a/src/settings_func.h b/src/settings_func.h
index e04038ef71..44ac18442e 100644
--- a/src/settings_func.h
+++ b/src/settings_func.h
@@ -26,7 +26,12 @@ void SaveGRFPresetToConfig(const char *config_name, struct GRFConfig *config);
 void DeleteGRFPresetFromConfig(const char *config_name);
 
 uint GetCompanySettingIndex(const char *name);
-void SyncCompanySettings();
 void SetDefaultCompanySettings(CompanyID cid);
 
+#if defined(ENABLE_NETWORK)
+void SyncCompanySettings();
+#else /* ENABLE_NETWORK */
+static inline void SyncCompanySettings() {}
+#endif /* ENABLE_NETWORK */
+
 #endif /* SETTINGS_FUNC_H */