diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index 71a3bdeaf..4c4f97999 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -1485,6 +1485,7 @@ static struct inp_read_t inp_read(FILE* fp, int call_depth, const char* dir_name
                 tmpcomp.eg = newcompat.eg; /* EAGLE */
                 tmpcomp.mc = newcompat.mc; /* to be set for 'make check' */
                 tmpcomp.xs = newcompat.xs; /* XSPICE */
+                tmpcomp.de = newcompat.de; /* degradation */
                 /* save the new comptmode */
                 newcompat.isset = TRUE; /* at least one mode is set */
                 if (ciprefix(".incpslt", buffer)) {
@@ -1505,6 +1506,7 @@ static struct inp_read_t inp_read(FILE* fp, int call_depth, const char* dir_name
                 newcompat.eg = FALSE;
                 newcompat.mc = FALSE;
                 newcompat.xs = FALSE;
+                newcompat.de = FALSE;
             }
 
             inp_stripcomments_line(buffer, FALSE, TRUE);
@@ -1648,6 +1650,7 @@ static struct inp_read_t inp_read(FILE* fp, int call_depth, const char* dir_name
                 newcompat.eg = tmpcomp.eg; /* EAGLE */
                 newcompat.mc = tmpcomp.mc; /* to be set for 'make check' */
                 newcompat.xs = tmpcomp.xs; /* XSPICE */
+                newcompat.de = tmpcomp.de; /* degradation */
             }
 
         } /*  end of .include handling  */
diff --git a/src/frontend/inpcompat.c b/src/frontend/inpcompat.c
index d1c22f5a2..38c2de705 100644
--- a/src/frontend/inpcompat.c
+++ b/src/frontend/inpcompat.c
@@ -78,6 +78,8 @@ void set_compat_mode(void)
             newcompat.isset = newcompat.ps = TRUE; /*PSPICE*/
         if (strstr(behaviour, "xs"))
             newcompat.isset = newcompat.xs = TRUE; /*XSPICE*/
+        if (strstr(behaviour, "de"))
+            newcompat.isset = newcompat.de = TRUE; /*degradation*/
         if (strstr(behaviour, "lt"))
             newcompat.isset = newcompat.lt = TRUE; /*LTSPICE*/
         if (strstr(behaviour, "ki"))
@@ -106,7 +108,7 @@ void set_compat_mode(void)
     /* reset everything for 'make check' */
     if (newcompat.mc)
         newcompat.eg = newcompat.hs = newcompat.spe = newcompat.ps = newcompat.xs =
-        newcompat.ll = newcompat.lt = newcompat.ki = newcompat.a = FALSE;
+        newcompat.ll = newcompat.lt = newcompat.ki = newcompat.a = newcompat.de = FALSE;
 }
 
 /* Print the compatibility flags */
@@ -136,6 +138,8 @@ void print_compat_mode(void) {
             fprintf(stdout, " spe");
         if (newcompat.a)
             fprintf(stdout, " a");
+        if (newcompat.de)
+            fprintf(stdout, " de");
         fprintf(stdout, "\n\n");
     }
     else {
diff --git a/src/include/ngspice/compatmode.h b/src/include/ngspice/compatmode.h
index 1355a74ed..702069c60 100644
--- a/src/include/ngspice/compatmode.h
+++ b/src/include/ngspice/compatmode.h
@@ -17,6 +17,7 @@ struct compat
 	bool eg; /* EAGLE */
 	bool mc; /* to be set for 'make check' */
 	bool xs; /* XSPICE */
+	bool de; /* degradation sim */
 };
 
 extern struct compat newcompat;