diff --git a/internal.h b/internal.h
index 8ded0e1343..92b3ba8745 100644
--- a/internal.h
+++ b/internal.h
@@ -1859,9 +1859,6 @@ void rb_autoload_str(VALUE mod, ID id, VALUE file);
 void rb_deprecate_constant(VALUE mod, const char *name);
 NORETURN(VALUE rb_mod_const_missing(VALUE,VALUE));
 
-/* version.c */
-extern const char ruby_engine[];
-
 /* vm_insnhelper.h */
 rb_serial_t rb_next_class_serial(void);
 
diff --git a/ruby.c b/ruby.c
index 79fb6d1635..1fd2bd715a 100644
--- a/ruby.c
+++ b/ruby.c
@@ -17,6 +17,7 @@
 #endif
 #include "ruby/encoding.h"
 #include "ruby/thread.h"
+#include "ruby/version.h"
 #include "internal.h"
 #include "eval_intern.h"
 #include "dln.h"