diff --git a/array.c b/array.c
index 271e2187e6..a7c74a2aa4 100644
--- a/array.c
+++ b/array.c
@@ -2463,7 +2463,7 @@ rb_ary_bsearch(VALUE ary)
 	}
 	else {
 	    rb_raise(rb_eTypeError, "wrong argument type %s"
-		" (must respond be numeric, true, false or nil)",
+		" (must be numeric, true, false or nil)",
 		rb_obj_classname(v));
 	}
 	if (smaller) {
diff --git a/range.c b/range.c
index 693920b803..87e013d54a 100644
--- a/range.c
+++ b/range.c
@@ -596,7 +596,7 @@ range_bsearch(VALUE range)
 	} \
 	else { \
 	    rb_raise(rb_eTypeError, "wrong argument type %s" \
-		" (must respond be numeric, true, false or nil)", \
+		" (must be numeric, true, false or nil)", \
 		rb_obj_classname(v)); \
 	} \
     } while (0)