diff --git a/panda/src/linmath/lrotation_src.I b/panda/src/linmath/lrotation_src.I
index 03613dc5ea..626a0f6618 100644
--- a/panda/src/linmath/lrotation_src.I
+++ b/panda/src/linmath/lrotation_src.I
@@ -35,6 +35,16 @@ FLOATNAME(LRotation)(const FLOATNAME(LQuaternion) &c) :
   FLOATNAME(LQuaternion)(c) {
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: LRotation::Copy Constructor
+//       Access: public
+//  Description:
+////////////////////////////////////////////////////////////////////
+INLINE_LINMATH FLOATNAME(LRotation)::
+FLOATNAME(LRotation)(const FLOATNAME(LVecBase4) &copy) :
+  FLOATNAME(LQuaternion)(copy) {
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: LRotation::Constructor
 //       Access: public
diff --git a/panda/src/linmath/lrotation_src.h b/panda/src/linmath/lrotation_src.h
index f8b7e1583d..a5ac5efe99 100644
--- a/panda/src/linmath/lrotation_src.h
+++ b/panda/src/linmath/lrotation_src.h
@@ -24,6 +24,7 @@ class EXPCL_PANDA FLOATNAME(LRotation) : public FLOATNAME(LQuaternion) {
 PUBLISHED:
   INLINE_LINMATH FLOATNAME(LRotation)();
   INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LQuaternion) &);
+  INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LVecBase4) &copy);
   INLINE_LINMATH FLOATNAME(LRotation)(FLOATTYPE, FLOATTYPE, FLOATTYPE, FLOATTYPE);
   INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LVector3) &, FLOATTYPE);
   INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LMatrix3) &);