diff --git a/Sources/Plasma/PubUtilLib/plPhysical/plCollisionDetector.h b/Sources/Plasma/PubUtilLib/plPhysical/plCollisionDetector.h
index 9b182d42..8a832b5e 100644
--- a/Sources/Plasma/PubUtilLib/plPhysical/plCollisionDetector.h
+++ b/Sources/Plasma/PubUtilLib/plPhysical/plCollisionDetector.h
@@ -93,7 +93,7 @@ class plObjectInVolumeDetector : public plCollisionDetector
 public:
     class plCollisionBookKeepingInfo
     {
-        friend plObjectInVolumeDetector;
+        friend class plObjectInVolumeDetector;
         public:
             plCollisionBookKeepingInfo(plKey& hit)
             {