diff --git a/Code/Mantid/Framework/Kernel/inc/MantidKernel/QuasiRandomNumberSequence.h b/Code/Mantid/Framework/Kernel/inc/MantidKernel/QuasiRandomNumberSequence.h
index 1b52c89e81a5fe6d2b5bfc4aaa66f66a99a5e52e..817e0349a8100b211fc651c302c65cb6e60b092a 100644
--- a/Code/Mantid/Framework/Kernel/inc/MantidKernel/QuasiRandomNumberSequence.h
+++ b/Code/Mantid/Framework/Kernel/inc/MantidKernel/QuasiRandomNumberSequence.h
@@ -36,7 +36,7 @@ namespace Mantid
      * progressively covers a d-dimensional space with a set of points that are
      * uniformly distributed.
      */
-    class QuasiRandomNumberSequence : NDRandomNumberGenerator
+    class MANTID_KERNEL_DLL QuasiRandomNumberSequence : NDRandomNumberGenerator
     {
     };
   }
diff --git a/Code/Mantid/Framework/Kernel/inc/MantidKernel/SobolSequence.h b/Code/Mantid/Framework/Kernel/inc/MantidKernel/SobolSequence.h
index 30436e12c516879b0b7f41aa9c62b116610e0891..65e73a69546531bffb52cc7c0ab24845f465544a 100644
--- a/Code/Mantid/Framework/Kernel/inc/MantidKernel/SobolSequence.h
+++ b/Code/Mantid/Framework/Kernel/inc/MantidKernel/SobolSequence.h
@@ -41,7 +41,7 @@ namespace Mantid
      * Defines a generator that produces quasi-random numbers according
      * to a Sobol sequence http://en.wikipedia.org/wiki/Sobol_sequence
      */
-    class SobolSequence : public QuasiRandomNumberSequence
+    class MANTID_KERNEL_DLL SobolSequence : public QuasiRandomNumberSequence
     {
     public:
       /// Constructor taking the number of dimensions