diff --git a/source/dyaml/exception.d b/source/dyaml/exception.d
index d1ef78c..1c3d571 100644
--- a/source/dyaml/exception.d
+++ b/source/dyaml/exception.d
@@ -45,7 +45,7 @@ struct Mark
         }
 
         ///Get a string representation of the mark.
-        string toString() const @trusted
+        string toString() const @trusted pure
         {
             //Line/column numbers start at zero internally, make them start at 1.
             string clamped(ushort v){return str(v + 1) ~ (v == ushort.max ? " or higher" : "");}
@@ -81,7 +81,7 @@ abstract class MarkedYAMLException : YAMLException
 template ExceptionCtors()
 {
     public this(string msg, string file = __FILE__, int line = __LINE__)
-        @safe nothrow
+        @safe pure nothrow
     {
         super(msg, file, line);
     }
@@ -92,14 +92,14 @@ template MarkedExceptionCtors()
 {
     public:
         this(string context, Mark contextMark, string problem, Mark problemMark,
-             string file = __FILE__, int line = __LINE__) @safe
+             string file = __FILE__, int line = __LINE__) @safe pure
         {
             super(context, contextMark, problem, problemMark, 
                   file, line);
         }
 
         this(string problem, Mark problemMark, string file = __FILE__, int line = __LINE__)
-            @safe
+            @safe pure
         {
             super(problem, problemMark, file, line);
         }