diff --git a/src/include/mrc_cache.h b/src/include/mrc_cache.h
index 4511fc3016..498ecbf86c 100644
--- a/src/include/mrc_cache.h
+++ b/src/include/mrc_cache.h
@@ -18,6 +18,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <commonlib/region.h>
 
 enum {
 	MRC_TRAINING_DATA,