diff --git a/test/util-test.cc b/test/util-test.cc
index fd295525..8b8a20a1 100644
--- a/test/util-test.cc
+++ b/test/util-test.cc
@@ -699,9 +699,8 @@ void test_count_digits() {
 }
 
 TEST(UtilTest, StringRef) {
-  char space[100];
-  std::strcpy(space, "some string");
-  EXPECT_EQ(sizeof("some string") - 1, StringRef(space).size());
+  char space[100] = "some string";
+  EXPECT_EQ(std::strlen(space), StringRef(space).size());
 }
 
 TEST(UtilTest, CountDigits) {