diff --git a/src/charon/sa/authenticators/eap/sim_manager.h b/src/charon/sa/authenticators/eap/sim_manager.h
index 869e544a2..7acf8f87b 100644
--- a/src/charon/sa/authenticators/eap/sim_manager.h
+++ b/src/charon/sa/authenticators/eap/sim_manager.h
@@ -21,6 +21,7 @@
 #ifndef SIM_MANAGER_H_
 #define SIM_MANAGER_H_
 
+#include <crypto/hashers/hasher.h>
 #include <utils/identification.h>
 #include <utils/enumerator.h>