diff --git a/src/core/emsfactory.h b/src/core/emsfactory.h
index 771aad4af..3be963be0 100644
--- a/src/core/emsfactory.h
+++ b/src/core/emsfactory.h
@@ -19,6 +19,7 @@
 #ifndef EMSESP_EMSFACTORY_H_
 #define EMSESP_EMSFACTORY_H_
 
+#include <cstdint>
 #include <memory> // for unique_ptr
 #include <map>