diff --git a/test/blockstore/testutils/BlockStoreTest_Size.h b/test/blockstore/testutils/BlockStoreTest_Size.h
index a7697815..ea000091 100644
--- a/test/blockstore/testutils/BlockStoreTest_Size.h
+++ b/test/blockstore/testutils/BlockStoreTest_Size.h
@@ -140,7 +140,7 @@ private:
   }
 };
 
-constexpr std::array<size_t, 5> SIZES = {0, 1, 1024, 4096, 10*1024*1024};
+constexpr std::array<size_t, 5> SIZES = {{0, 1, 1024, 4096, 10*1024*1024}};
 #define TYPED_TEST_P_FOR_ALL_SIZES(TestName)                                    \
   TYPED_TEST_P(BlockStoreTest, TestName) {                                      \
     for (auto size: SIZES) {                                                    \
diff --git a/test/cpp-utils/assert/exit_signal.cpp b/test/cpp-utils/assert/exit_signal.cpp
index 911f95d9..4673703a 100644
--- a/test/cpp-utils/assert/exit_signal.cpp
+++ b/test/cpp-utils/assert/exit_signal.cpp
@@ -6,7 +6,7 @@
 #include <Windows.h>
 #endif
 
-int handle_exit_signal(char* argv[]) {
+void handle_exit_signal(char* argv[]) {
 	const std::string kind = argv[1];
 	if (kind == "exception") {
 		throw std::logic_error(argv[2]);
diff --git a/test/cpp-utils/crypto/symmetric/CipherTest.cpp b/test/cpp-utils/crypto/symmetric/CipherTest.cpp
index d4025645..cd30cc48 100644
--- a/test/cpp-utils/crypto/symmetric/CipherTest.cpp
+++ b/test/cpp-utils/crypto/symmetric/CipherTest.cpp
@@ -63,7 +63,7 @@ public:
 
 TYPED_TEST_CASE_P(CipherTest);
 
-constexpr std::array<unsigned int, 7> SIZES = {0, 1, 100, 1024, 5000, 1048576, 20971520};
+constexpr std::array<unsigned int, 7> SIZES = {{0, 1, 100, 1024, 5000, 1048576, 20971520}};
 
 TYPED_TEST_P(CipherTest, Size) {
   for (auto size: SIZES) {