diff --git a/common.mk b/common.mk
index 21f7784349..cd28bf57ca 100644
--- a/common.mk
+++ b/common.mk
@@ -1652,6 +1652,7 @@ localeinit.$(OBJEXT): $(hdrdir)/ruby/ruby.h
 localeinit.$(OBJEXT): $(top_srcdir)/include/ruby.h
 localeinit.$(OBJEXT): {$(VPATH)}config.h
 localeinit.$(OBJEXT): {$(VPATH)}defines.h
+localeinit.$(OBJEXT): {$(VPATH)}encindex.h
 localeinit.$(OBJEXT): {$(VPATH)}encoding.h
 localeinit.$(OBJEXT): {$(VPATH)}intern.h
 localeinit.$(OBJEXT): {$(VPATH)}internal.h
diff --git a/localeinit.c b/localeinit.c
index c83bf7e4d9..c4dda819b7 100644
--- a/localeinit.c
+++ b/localeinit.c
@@ -10,6 +10,7 @@
 **********************************************************************/
 
 #include "internal.h"
+#include "encindex.h"
 #ifdef __CYGWIN__
 #include <windows.h>
 #endif