diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index e548c2bd4..f532a3f63 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -449,6 +449,7 @@ struct card *insert_new_line(
     x->linenum_orig = linenum_orig;
     x->level = card ? card->level : NULL;
     x->linesource = lineinfo;
+    x->compmod = 0;
 
     if (card)
         card->nextcard = x;
@@ -950,7 +951,7 @@ void inp_get_w_l_x(struct card* card) {
             continue;
         }
         /* only subcircuit invocations */
-        if (*curr_line != 'x' || (!newcompat.hs && !newcompat.spe)) {
+        if (*curr_line != 'x' || (!newcompat.hs && !newcompat.spe) || card->compmod > 0) {
             continue;
         }
 
@@ -1430,6 +1431,47 @@ static struct inp_read_t inp_read(FILE* fp, int call_depth, const char* dir_name
 
             struct card* newcard;
 
+            struct compat tmpcomp;
+            bool compset = FALSE;
+
+            /* special treatment of special .inc commands */
+            if (ciprefix(".incpslt", buffer)) {
+                compset = TRUE;
+                /* save the current compatibility status */
+                tmpcomp.isset = newcompat.isset; /* at least one mode is set */
+                tmpcomp.hs = newcompat.hs; /* HSPICE */
+                tmpcomp.s3 = newcompat.s3; /* spice3 */
+                tmpcomp.ll = newcompat.ll; /* all */
+                tmpcomp.ps = newcompat.ps; /* PSPICE */
+                tmpcomp.lt = newcompat.lt; /* LTSPICE */
+                tmpcomp.ki = newcompat.ki; /* KiCad */
+                tmpcomp.a = newcompat.a; /* whole netlist */
+                tmpcomp.spe = newcompat.spe; /* spectre */
+                tmpcomp.eg = newcompat.eg; /* EAGLE */
+                tmpcomp.mc = newcompat.mc; /* to be set for 'make check' */
+                tmpcomp.xs = newcompat.xs; /* XSPICE */
+                /* save the new comptmode */
+                newcompat.isset = TRUE; /* at least one mode is set */
+                if (ciprefix(".incpslt", buffer)) {
+                    newcompat.hs = FALSE;
+                    newcompat.ps = TRUE;
+                    newcompat.lt = TRUE;
+                }
+                else {
+                    newcompat.hs = TRUE;
+                    newcompat.ps = FALSE;
+                    newcompat.lt = FALSE;
+                }
+                newcompat.s3 = FALSE;
+                newcompat.ll = FALSE;
+                newcompat.ki = FALSE;
+                newcompat.a = FALSE;
+                newcompat.spe = FALSE;
+                newcompat.eg = FALSE;
+                newcompat.mc = FALSE;
+                newcompat.xs = FALSE;
+            }
+
             inp_stripcomments_line(buffer, FALSE, TRUE);
 
             s = skip_non_ws(buffer); /* advance past non-space chars */
@@ -1507,10 +1549,15 @@ static struct inp_read_t inp_read(FILE* fp, int call_depth, const char* dir_name
             char* tmpstr = copy(nexttok(buffer));
             wl_append_word(&sourceinfo, &sourceinfo, tmpstr);
 
-            /* Add source of netlist data, for use in verbose error messages */
+            /* Add source of netlist data, for use in verbose error messages.
+               Set the compatibility mode flag to 1, if pslt is read. */
             for (tmpcard = newcard; tmpcard; tmpcard = tmpcard->nextcard) {
                 /* skip *include */
                 tmpcard->linesource = tmpstr;
+                if (compset)
+                    tmpcard->compmod = 1;
+                else
+                    tmpcard->compmod = 0;
             }
 
             if (newcard) {
@@ -1533,6 +1580,23 @@ static struct inp_read_t inp_read(FILE* fp, int call_depth, const char* dir_name
 
             /* Fix the buffer up a bit. */
             (void)memcpy(buffer + 1, "end of: ", 8);
+
+            if (compset) {
+                /* restore the previous compatibility status */
+                newcompat.isset = tmpcomp.isset; /* at least one mode is set */
+                newcompat.hs = tmpcomp.hs; /* HSPICE */
+                newcompat.s3 = tmpcomp.s3; /* spice3 */
+                newcompat.ll = tmpcomp.ll; /* all */
+                newcompat.ps = tmpcomp.ps; /* PSPICE */
+                newcompat.lt = tmpcomp.lt; /* LTSPICE */
+                newcompat.ki = tmpcomp.ki; /* KiCad */
+                newcompat.a = tmpcomp.a; /* whole netlist */
+                newcompat.spe = tmpcomp.spe; /* spectre */
+                newcompat.eg = tmpcomp.eg; /* EAGLE */
+                newcompat.mc = tmpcomp.mc; /* to be set for 'make check' */
+                newcompat.xs = tmpcomp.xs; /* XSPICE */
+            }
+
         } /*  end of .include handling  */
 
         /* loop through 'buffer' until end is reached. Make all letters lower
@@ -3704,7 +3768,7 @@ static void inp_fix_for_numparam(
 
         inp_change_quotes(c->line);
 
-        if (!newcompat.hs && !newcompat.s3)
+        if ((!newcompat.hs && !newcompat.s3) || c->compmod > 0)
             if (ciprefix(".subckt", c->line) || ciprefix("x", c->line)) {
                 /* remove params: */
                 char *str_ptr = strstr(c->line, "params:");
@@ -4038,7 +4102,7 @@ static int inp_fix_subckt_multiplier(struct names *subckt_w_params,
         /* no 'm' for model cards */
         if (ciprefix(".model", curr_line))
             continue;
-        if (newcompat.hs) {
+        if (newcompat.hs && card->compmod == 0) {
             /* if there is already an m=xx in the instance line, multiply it with the new m */
             char* mult = strstr(curr_line, " m=");
             if (mult) {
diff --git a/src/frontend/options.c b/src/frontend/options.c
index 777f1c5a6..0b54881ba 100644
--- a/src/frontend/options.c
+++ b/src/frontend/options.c
@@ -256,6 +256,7 @@ inp_getoptsc(char *line, struct card *options)
     next->linenum = 0;
     next->error   = NULL;
     next->actualLine  = NULL;
+    next->compmod = 0;
 
     /* put new line in front */
     next->nextcard = options;
diff --git a/src/frontend/shyu.c b/src/frontend/shyu.c
index c8436c64c..c59c63341 100644
--- a/src/frontend/shyu.c
+++ b/src/frontend/shyu.c
@@ -51,6 +51,7 @@ if_sens_run(CKTcircuit *ckt, wordlist *args, INPtables *tab)
     deck.error        = NULL;
     deck.linenum      = 0;
     deck.linenum_orig = 0;
+    deck.compmod = 0;
     deck.line         = buf;
 
     current = &deck;
diff --git a/src/frontend/spiceif.c b/src/frontend/spiceif.c
index 83d589d3a..c56c37609 100644
--- a/src/frontend/spiceif.c
+++ b/src/frontend/spiceif.c
@@ -248,6 +248,7 @@ if_run(CKTcircuit *ckt, char *what, wordlist *args, INPtables *tab)
         deck.nextcard = deck.actualLine = NULL;
         deck.error = NULL;
         deck.linenum = 0;
+        deck.compmod = 0;
         deck.line = buf;
 
         /*CDHW Delete any previous special task CDHW*/
diff --git a/src/frontend/subckt.c b/src/frontend/subckt.c
index 218502222..4cb7be417 100644
--- a/src/frontend/subckt.c
+++ b/src/frontend/subckt.c
@@ -847,6 +847,7 @@ struct card * inp_deckcopy(struct card *deck) {
         }
         d->linenum = deck->linenum;
         d->linenum_orig = deck->linenum_orig;
+        d->compmod = deck->compmod;
         d->linesource = deck->linesource;
         d->w = deck->w;
         d->l = deck->l;
@@ -897,6 +898,7 @@ struct card *inp_deckcopy_oc(struct card * deck)
         d->l = deck->l;
         d->nf = deck->nf;
         d->linenum_orig = deck->linenum_orig;
+        d->compmod = deck->compmod;
         d->linesource = deck->linesource;
         d->linenum = i++;
         d->line = copy(deck->line);
@@ -957,6 +959,7 @@ struct card* inp_deckcopy_ln(struct card* deck)
         d->linenum_orig = deck->linenum_orig;
         d->linesource = deck->linesource;
         d->linenum = deck->linenum;
+        d->compmod = deck->compmod;
         d->line = copy(deck->line);
         if (deck->error) {
             d->error = copy(deck->error);
diff --git a/src/include/ngspice/inpdefs.h b/src/include/ngspice/inpdefs.h
index 36203bc11..d61bb5469 100644
--- a/src/include/ngspice/inpdefs.h
+++ b/src/include/ngspice/inpdefs.h
@@ -86,6 +86,7 @@ struct card {
     float w;
     float l;
     float nf;
+    int compmod;
 };
 
 /* structure used to save models in after they are read during pass 1 */