diff --git a/stdlib/public/core/Sequence.swift b/stdlib/public/core/Sequence.swift
index 665c4707676f2..411ef51d65050 100644
--- a/stdlib/public/core/Sequence.swift
+++ b/stdlib/public/core/Sequence.swift
@@ -725,14 +725,6 @@ internal class _PrefixSequence<Base : IteratorProtocol>
         maxLength: Swift.min(maxLength, self._maxLength),
         taken: _taken))
   }
-  
-  internal func drop(
-    while predicate: (Base.Element) throws -> Bool
-  ) rethrows -> AnySequence<Base.Element> {
-    return try AnySequence(
-      _DropWhileSequence(
-        iterator: _iterator, nextElement: nil, predicate: predicate))
-  }
 }
 
 /// A sequence that lazily consumes and drops `n` elements from an underlying
diff --git a/validation-test/stdlib/SequenceType.swift.gyb b/validation-test/stdlib/SequenceType.swift.gyb
index 100be387a42d6..ae91910948eb7 100644
--- a/validation-test/stdlib/SequenceType.swift.gyb
+++ b/validation-test/stdlib/SequenceType.swift.gyb
@@ -982,6 +982,11 @@ SequenceTypeTests.test("prefix/dispatch") {
   expectCustomizable(tester, tester.log.prefixMaxLength)
 }
 
+SequenceTypeTests.test("prefix/drop/dispatch") {
+  let xs = sequence(first: 1, next: {$0 < 10 ? $0 + 1 : nil})
+  expectEqualSequence([], Array(xs.prefix(3).drop(while: {$0 < 7})))
+}
+
 //===----------------------------------------------------------------------===//
 // prefix(while:)
 //===----------------------------------------------------------------------===//