diff --git a/sim/common/sim-endian.h b/sim/common/sim-endian.h
index 589169ea11c..93a6d0d8c13 100644
--- a/sim/common/sim-endian.h
+++ b/sim/common/sim-endian.h
@@ -23,6 +23,8 @@
 #ifndef SIM_ENDIAN_H
 #define SIM_ENDIAN_H
 
+#include "sim-types.h"
+
 /* C byte conversion functions */
 
 INLINE_SIM_ENDIAN(unsigned_1) endian_h2t_1(unsigned_1 x);