diff --git a/src/config.rs b/src/config.rs
index a16c272..29ff8b9 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -188,9 +188,22 @@ pub fn load_config() -> Result<Config, ConfigError> {
     let mut networks: Vec<Network> = vec![];
     for toml_network in toml_config.networks.iter() {
         let mut nodes: Vec<BoxedSyncSendNode> = vec![];
+        let mut node_ids: Vec<u32> = vec![];
         for toml_node in toml_network.nodes.iter() {
             match parse_toml_node(toml_node) {
-                Ok(node) => nodes.push(node),
+                Ok(node) => {
+                    if !node_ids.contains(&node.info().id) {
+                        node_ids.push(node.info().id);
+                        nodes.push(node);
+                    } else {
+                        error!(
+                            "Duplicate node id {}: The node {} could not be loaded.",
+                            node.info().id,
+                            node.info()
+                        );
+                        return Err(ConfigError::DuplicateNodeId);
+                    }
+                }
                 Err(e) => {
                     error!("Error while parsing a node configuration: {}", toml_node);
                     return Err(e);
diff --git a/src/error.rs b/src/error.rs
index 3da75e4..5abf5f2 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -111,6 +111,7 @@ pub enum ConfigError {
     NoBtcdRpcAuth,
     NoNetworks,
     UnknownImplementation,
+    DuplicateNodeId,
     TomlError(toml::de::Error),
     ReadError(io::Error),
     AddrError(AddrParseError),
@@ -124,6 +125,7 @@ impl fmt::Display for ConfigError {
             ConfigError::NoBtcdRpcAuth => write!(f, "no values for rpc_user and rpc_password"),
             ConfigError::NoNetworks => write!(f, "no networks defined in the configuration"),
             ConfigError::UnknownImplementation => write!(f, "the node implementation defined in the config is not supported"),
+            ConfigError::DuplicateNodeId => write!(f, "a node id has been used multiple times in the same network"),
             ConfigError::TomlError(e) => write!(f, "the TOML in the configuration file could not be parsed: {}", e),
             ConfigError::ReadError(e) => write!(f, "the configuration file could not be read: {}", e),
             ConfigError::AddrError(e) => write!(f, "the address could not be parsed: {}", e),
@@ -142,6 +144,7 @@ impl error::Error for ConfigError {
             ConfigError::TomlError(ref e) => Some(e),
             ConfigError::ReadError(ref e) => Some(e),
             ConfigError::AddrError(ref e) => Some(e),
+            ConfigError::DuplicateNodeId => None,
         }
     }
 }