diff --git a/tests/long_test.cpp b/tests/long_test.cpp
index 40539ef..feab4d0 100644
--- a/tests/long_test.cpp
+++ b/tests/long_test.cpp
@@ -22,7 +22,7 @@ template <typename T> bool test() {
   char const *begin = input.data();
   char const *end = input.data() + input.size();
   for (size_t i = 0; i < answers.size(); i++) {
-    T result_value;
+    T result_value = 0;
     while ((begin < end) && (std::isspace(*begin))) {
       begin++;
     }
diff --git a/tests/string_test.cpp b/tests/string_test.cpp
index 68828ac..69d2a31 100644
--- a/tests/string_test.cpp
+++ b/tests/string_test.cpp
@@ -98,7 +98,7 @@ template <typename T> bool test() {
   char const *begin = input.data();
   char const *end = input.data() + input.size();
   for (size_t i = 0; i < answers.size(); i++) {
-    T result_value;
+    T result_value = 0;
     while ((begin < end) && (std::isspace(*begin))) {
       begin++;
     }