diff --git a/inc/TRestRawUSTCToSignalProcess.h b/inc/TRestRawUSTCToSignalProcess.h
index babb0f9a..1ad37dc5 100644
--- a/inc/TRestRawUSTCToSignalProcess.h
+++ b/inc/TRestRawUSTCToSignalProcess.h
@@ -23,6 +23,8 @@
 #ifndef RestCore_TRestRawUSTCToSignalProcess
 #define RestCore_TRestRawUSTCToSignalProcess
 
+#include <map>
+
 #include "TRestRawToSignalProcess.h"
 
 //#define V3_Readout_Format_Long