diff --git a/googlemock/include/gmock/gmock-matchers.h b/googlemock/include/gmock/gmock-matchers.h
index 6b264d69..a480576d 100644
--- a/googlemock/include/gmock/gmock-matchers.h
+++ b/googlemock/include/gmock/gmock-matchers.h
@@ -1474,6 +1474,7 @@ class SomeOfArrayMatcher {
   operator Matcher<U>() const {  // NOLINT
     using RawU = typename std::decay<U>::type;
     std::vector<Matcher<RawU>> matchers;
+    matchers.reserve(matchers_.size());
     for (const auto& matcher : matchers_) {
       matchers.push_back(MatcherCast<RawU>(matcher));
     }