diff --git a/src/Network/ACSFNeuralNetwork.h b/src/Network/ACSFNeuralNetwork.h
index 8c9615f42e84c86292b7f20480761e3dbfbae2ec..2d6fa571d5924a089530b0dd35a1b2beab05cbf8 100644
--- a/src/Network/ACSFNeuralNetwork.h
+++ b/src/Network/ACSFNeuralNetwork.h
@@ -5,6 +5,8 @@
 #ifndef LIB4NEURO_ACSFNEURALNETWORK_H
 #define LIB4NEURO_ACSFNEURALNETWORK_H
 
+#include <unordered_map>
+
 #include "NeuralNetwork.h"
 #include "../DataSet/DataSet.h"