diff --git a/lib/core/include/qx/core/qx-abstracterror.h b/lib/core/include/qx/core/qx-abstracterror.h
index c01c763c..38317467 100644
--- a/lib/core/include/qx/core/qx-abstracterror.h
+++ b/lib/core/include/qx/core/qx-abstracterror.h
@@ -105,7 +105,7 @@ friend class Error;
 public:
     bool operator==(const AbstractError& other) const = default;
     bool operator!=(const AbstractError& other) const = default;
-    operator bool() const { return deriveValue() > 0; };
+    explicit operator bool() const { return deriveValue() > 0; };
 };
 
 /* TODO: Get string of the type automatically when it becomes
diff --git a/lib/core/include/qx/core/qx-error.h b/lib/core/include/qx/core/qx-error.h
index 65b97e44..ac5268fc 100644
--- a/lib/core/include/qx/core/qx-error.h
+++ b/lib/core/include/qx/core/qx-error.h
@@ -114,7 +114,7 @@ class QX_CORE_EXPORT Error
 public:
     bool operator==(const Error& other) const = default;
     bool operator!=(const Error& other) const = default;
-    operator bool() const;
+    explicit operator bool() const;
 
 //-Friend Functions------------------------------------------------------------------------------------------------
 friend QTextStream& ::operator<<(QTextStream& ts, const Error& e);