diff --git a/googlemock/test/gmock-matchers_test.cc b/googlemock/test/gmock-matchers_test.cc
index cc161346..f2ce8f24 100644
--- a/googlemock/test/gmock-matchers_test.cc
+++ b/googlemock/test/gmock-matchers_test.cc
@@ -696,7 +696,7 @@ TEST(MatcherCastTest, FromSameType) {
 struct ConvertibleFromAny {
   ConvertibleFromAny(int a_value) : value(a_value) {}
   template <typename T>
-  ConvertibleFromAny(const T& /*a_value*/) : value(-1) {
+explicit ConvertibleFromAny(const T& /*a_value*/) : value(-1) {
     ADD_FAILURE() << "Conversion constructor called";
   }
   int value;