diff --git a/src/token.h b/src/token.h
index 9c9a5b7..be07ce3 100644
--- a/src/token.h
+++ b/src/token.h
@@ -13,7 +13,7 @@
 #include <vector>
 
 namespace YAML {
-const std::string TokenNames[] = {
+constexpr char const* TokenNames[] = {
     "DIRECTIVE",        "DOC_START",      "DOC_END",       "BLOCK_SEQ_START",
     "BLOCK_MAP_START",  "BLOCK_SEQ_END",  "BLOCK_MAP_END", "BLOCK_ENTRY",
     "FLOW_SEQ_START",   "FLOW_MAP_START", "FLOW_SEQ_END",  "FLOW_MAP_END",
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 23fc0c5..6862797 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -6,7 +6,9 @@ set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
 
 add_subdirectory(
   "${CMAKE_CURRENT_SOURCE_DIR}/gtest-1.8.0"
-  "${CMAKE_CURRENT_BINARY_DIR}/prefix")
+  "${CMAKE_CURRENT_BINARY_DIR}/prefix"
+  EXCLUDE_FROM_ALL
+  )
 
 include_directories(SYSTEM "${CMAKE_CURRENT_SOURCE_DIR}/gtest-1.8.0/googletest/include")