diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index ccaac6566..17392f465 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -88,7 +88,7 @@ static int  num_parameters[1000];
 /* number of lines in input deck */
 int dynmaxline;  /* inpcom.c 1529 */
 /* max. line length in input deck */
-int dynLlen; /* inpcom.c 1526 */
+unsigned int dynLlen; /* inpcom.c 1526 */
  /* number of lines in deck after expansion */
 int dynMaxckt = 0; /* subckt.c 307 */
 /* number of parameter substitutions */
diff --git a/src/frontend/numparam/spicenum.c b/src/frontend/numparam/spicenum.c
index a9d4d6643..2d540a558 100644
--- a/src/frontend/numparam/spicenum.c
+++ b/src/frontend/numparam/spicenum.c
@@ -40,7 +40,7 @@ extern long dynsubst; /* spicenum.c:144 */
 extern int dynmaxline; /* inpcom.c:1529 */
 
 /* max. line length in input deck */
-int dynLlen; /* inpcom.c:1531 */
+unsigned int dynLlen; /* inpcom.c:1531 */
 
 /* Uncomment this line to allow debug tracing */
 /* #define TRACE_NUMPARAMS */
diff --git a/src/frontend/numparam/xpressn.c b/src/frontend/numparam/xpressn.c
index b1a268b38..92210197c 100644
--- a/src/frontend/numparam/xpressn.c
+++ b/src/frontend/numparam/xpressn.c
@@ -28,7 +28,7 @@ static Str (150, fmath);     /* all math functions */
 
 extern char *nupa_inst_name; /* see spicenum.c */
 extern long dynsubst;        /* see inpcom.c */
-extern int dynLlen;
+extern unsigned int dynLlen;
 
 static double
 ternary_fcn (int conditional, double if_value, double else_value)