diff --git a/vulkan/vkjson/vkjson.cc b/vulkan/vkjson/vkjson.cc
index 6204779..8f714d8 100644
--- a/vulkan/vkjson/vkjson.cc
+++ b/vulkan/vkjson/vkjson.cc
@@ -53,7 +53,7 @@
 // parsing in between C++ and Java, becasue Java json library simply cannot
 // handle infinity.
 static const double SAFE_DOUBLE_MAX = 0.99 * std::numeric_limits<double>::max();
-static const double SAFE_DOUBLE_MIN = 0.99 * std::numeric_limits<double>::min();
+static const double SAFE_DOUBLE_MIN = -SAFE_DOUBLE_MAX;
 
 template <typename T> struct EnumTraits;
 template <> struct EnumTraits<VkPhysicalDeviceType> {