diff --git a/ChangeLog b/ChangeLog
index 3f7f25908..8bc186440 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-2010-07-17  Robert Larice
+2010-07-19  Holger Vogt
+ * b4ld.c: correct typo which led to non-convergence of ro_17.cir
+ 
+ 2010-07-17  Robert Larice
  * src/main.c ,
  * src/frontend/inp.c ,
  * src/frontend/options.c ,
diff --git a/src/spicelib/devices/bsim4/b4ld.c b/src/spicelib/devices/bsim4/b4ld.c
index b11ef34c2..b4ed1f71a 100644
--- a/src/spicelib/devices/bsim4/b4ld.c
+++ b/src/spicelib/devices/bsim4/b4ld.c
@@ -5053,7 +5053,7 @@ line900:
                (*(here->BSIM4SbpPtr) += m * gstotb);
 	   }
 
-           (*(here->BSIM4DPdpPtr) = m * (gdpr + here->BSIM4gds + here->BSIM4gbd + T1 * ddxpart_dVd
+           (*(here->BSIM4DPdpPtr) += m * (gdpr + here->BSIM4gds + here->BSIM4gbd + T1 * ddxpart_dVd
                                    - gdtotd + RevSum + gcddb + gbdpdp + dxpart * ggtd - gIdtotd));
            (*(here->BSIM4DPdPtr) -= m * (gdpr + gdtot));
            (*(here->BSIM4DPgpPtr) += m * (Gm + gcdgb - gdtotg + gbdpg - gIdtotg