diff --git a/src/spicelib/devices/bsim3/b3.c b/src/spicelib/devices/bsim3/b3.c
index e14770458..eedf4e24e 100644
--- a/src/spicelib/devices/bsim3/b3.c
+++ b/src/spicelib/devices/bsim3/b3.c
@@ -185,6 +185,10 @@ IOP( "lwl",  BSIM3_MOD_LWL, IF_REAL, "Length reduction parameter"),
 IOP( "lwlc", BSIM3_MOD_LWLC, IF_REAL, "Length reduction parameter for CV"),
 IOP( "lmin", BSIM3_MOD_LMIN, IF_REAL, "Minimum length for the model"),
 IOP( "lmax", BSIM3_MOD_LMAX, IF_REAL, "Maximum length for the model"),
+
+IOP( "xl", BSIM3_MOD_XL, IF_REAL, "Length correction parameter"),
+IOP( "xw", BSIM3_MOD_XW, IF_REAL, "Width correction parameter"),
+
 IOP( "wr",   BSIM3_MOD_WR, IF_REAL, "Width dependence of rds"),
 IOP( "wint", BSIM3_MOD_WINT, IF_REAL, "Width reduction parameter"),
 IOP( "dwg",  BSIM3_MOD_DWG, IF_REAL, "Width reduction parameter"),
diff --git a/src/spicelib/devices/bsim3/b3mask.c b/src/spicelib/devices/bsim3/b3mask.c
index 46955243e..822e95920 100644
--- a/src/spicelib/devices/bsim3/b3mask.c
+++ b/src/spicelib/devices/bsim3/b3mask.c
@@ -1251,6 +1251,14 @@ IFvalue *value)
         case BSIM3_MOD_WMAX:
             value->rValue = model->BSIM3Wmax;
             return(OK);
+
+        case BSIM3_MOD_XL:
+            value->rValue = model->BSIM3xl;
+            return(OK);
+        case BSIM3_MOD_XW:
+            value->rValue = model->BSIM3xw;
+            return(OK);
+
         case BSIM3_MOD_NOIA:
             value->rValue = model->BSIM3oxideTrapDensityA;
             return(OK);
diff --git a/src/spicelib/devices/bsim3/b3mpar.c b/src/spicelib/devices/bsim3/b3mpar.c
index 9b3699634..f43325ed8 100644
--- a/src/spicelib/devices/bsim3/b3mpar.c
+++ b/src/spicelib/devices/bsim3/b3mpar.c
@@ -1678,6 +1678,15 @@ GENmodel *inMod)
             mod->BSIM3WmaxGiven = TRUE;
             break;
 
+       case BSIM3_MOD_XL:
+            mod->BSIM3xl = value->rValue;
+            mod->BSIM3xlGiven = TRUE;
+            break;
+       case BSIM3_MOD_XW:
+            mod->BSIM3xw = value->rValue;
+            mod->BSIM3xwGiven = TRUE;
+            break;
+
         case  BSIM3_MOD_NOIA :
             mod->BSIM3oxideTrapDensityA = value->rValue;
             mod->BSIM3oxideTrapDensityAGiven = TRUE;
diff --git a/src/spicelib/devices/bsim3/b3set.c b/src/spicelib/devices/bsim3/b3set.c
index 379cc4b26..ef043998c 100644
--- a/src/spicelib/devices/bsim3/b3set.c
+++ b/src/spicelib/devices/bsim3/b3set.c
@@ -802,6 +802,12 @@ BSIM3instance **InstArray;
            model->BSIM3dwc = model->BSIM3Wint;
         if (!model->BSIM3dlcGiven)
            model->BSIM3dlc = model->BSIM3Lint;
+
+        if (!model->BSIM3xlGiven)
+           model->BSIM3xl = 0.0;
+        if (!model->BSIM3xwGiven)
+           model->BSIM3xw = 0.0;
+
         if (!model->BSIM3cfGiven)
             model->BSIM3cf = 2.0 * EPSOX / PI
                            * log(1.0 + 0.4e-6 / model->BSIM3tox);
diff --git a/src/spicelib/devices/bsim3/b3temp.c b/src/spicelib/devices/bsim3/b3temp.c
index 0e1a18574..627d99749 100644
--- a/src/spicelib/devices/bsim3/b3temp.c
+++ b/src/spicelib/devices/bsim3/b3temp.c
@@ -193,7 +193,7 @@ int Size_Not_Found, error;
                        + model->BSIM3Wwlc / (T2 * T3);
                   pParam->BSIM3dwc = model->BSIM3dwc + tmp2;
 
-                  pParam->BSIM3leff = here->BSIM3l - 2.0 * pParam->BSIM3dl;
+                  pParam->BSIM3leff = here->BSIM3l + model->BSIM3xl - 2.0 * pParam->BSIM3dl;
                   if (pParam->BSIM3leff <= 0.0)
                   {   IFuid namarray[2];
                       namarray[0] = model->BSIM3modName;
@@ -204,7 +204,7 @@ int Size_Not_Found, error;
                       return(E_BADPARM);
                   }
 
-                  pParam->BSIM3weff = here->BSIM3w - 2.0 * pParam->BSIM3dw;
+                  pParam->BSIM3weff = here->BSIM3w + model->BSIM3xw - 2.0 * pParam->BSIM3dw;
                   if (pParam->BSIM3weff <= 0.0)
                   {   IFuid namarray[2];
                       namarray[0] = model->BSIM3modName;
@@ -215,7 +215,7 @@ int Size_Not_Found, error;
                       return(E_BADPARM);
                   }
 
-                  pParam->BSIM3leffCV = here->BSIM3l - 2.0 * pParam->BSIM3dlc;
+                  pParam->BSIM3leffCV = here->BSIM3l + model->BSIM3xl - 2.0 * pParam->BSIM3dlc;
                   if (pParam->BSIM3leffCV <= 0.0)
                   {   IFuid namarray[2];
                       namarray[0] = model->BSIM3modName;
@@ -226,7 +226,7 @@ int Size_Not_Found, error;
                       return(E_BADPARM);
                   }
 
-                  pParam->BSIM3weffCV = here->BSIM3w - 2.0 * pParam->BSIM3dwc;
+                  pParam->BSIM3weffCV = here->BSIM3w + model->BSIM3xw - 2.0 * pParam->BSIM3dwc;
                   if (pParam->BSIM3weffCV <= 0.0)
                   {   IFuid namarray[2];
                       namarray[0] = model->BSIM3modName;