diff --git a/src/value.cpp b/src/value.cpp
index 4c3b2f277..ecb8a81ed 100644
--- a/src/value.cpp
+++ b/src/value.cpp
@@ -441,7 +441,7 @@ struct convert<value_bool>
     template<typename T>
     value_bool operator()(T val) const
     {
-        return val > 0 ? true : false;
+        return val == 0 ? false : true;
     }
 };