diff --git a/include/osgParticle/ParticleSystem b/include/osgParticle/ParticleSystem
index e3e76f46b..a38a5a1c5 100644
--- a/include/osgParticle/ParticleSystem
+++ b/include/osgParticle/ParticleSystem
@@ -326,7 +326,7 @@ namespace osgParticle
 
         int _estimatedMaxNumOfParticles;
 
-        struct ArrayData
+        struct OSGPARTICLE_EXPORT ArrayData
         {
             ArrayData();