diff --git a/ChangeLog b/ChangeLog
index 910b10c33..4e9eb5ab4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2005-06-30  Paolo Nenzi <p.nenzi@ieee.org>
+
+  *   src/spicelib/parser/inpptree.c: fixed bug in power function.
+
 2005-06-25  Paolo Nenzi <p.nenzi@ieee.org>
 
   *  src/spicelib/analysis/acan.c: modified original integration of xspice 
diff --git a/src/spicelib/parser/inpptree.c b/src/spicelib/parser/inpptree.c
index c01eef8a4..ac4fa0aa9 100644
--- a/src/spicelib/parser/inpptree.c
+++ b/src/spicelib/parser/inpptree.c
@@ -222,7 +222,8 @@ static INPparseNode *PTdifferentiate(INPparseNode * p, int varnum)
 		       mkb(PT_PLUS,
 			   mkb(PT_TIMES, p->right,
 			       mkb(PT_DIVIDE, arg1, p->left)),
-			   mkb(PT_TIMES, arg2, mkf(PTF_LN, arg1))));
+			   mkb(PT_TIMES, arg2, mkf(PTF_LN, /*arg1*/p->left))));
+		                                        /*changed by HT, '05/06/29*/
 
 	}
 	break;