diff -up fig2dev-3.2.6a/fig2dev/read.c.orig fig2dev-3.2.6a/fig2dev/read.c
--- fig2dev-3.2.6a/fig2dev/read.c.orig	2017-01-07 23:01:19.000000000 +0100
+++ fig2dev-3.2.6a/fig2dev/read.c	2017-11-21 15:17:31.195643198 +0100
@@ -1329,8 +1329,14 @@ read_textobject(FILE *fp)
 				| PSFONT_TEXT;
 
 	/* keep the font number reasonable */
-	if (t->font > MAXFONT(t))
+	if (t->font > MAXFONT(t)) {
 		t->font = MAXFONT(t);
+	} else if (t->font < 0 ) {
+		if (psfont_text(t) && t->font < -1)
+			t->font = -1;
+		else
+			t->font = 0;
+	}
 	fix_and_note_color(&t->color);
 	t->comments = attach_comments();	/* attach any comments */
 	return t;
diff -up fig2dev-3.2.6a/fig2dev/read1_3.c.orig fig2dev-3.2.6a/fig2dev/read1_3.c
--- fig2dev-3.2.6a/fig2dev/read1_3.c.orig	2016-08-19 21:34:38.000000000 +0200
+++ fig2dev-3.2.6a/fig2dev/read1_3.c	2017-11-21 15:17:31.196643206 +0100
@@ -470,6 +470,15 @@ read_textobject(FILE *fp)
 	    free((char*) t);
 	    return(NULL);
 	    }
+	/* keep the font number within valid range */
+	if (t->font > MAXFONT(t)) {
+		t->font = MAXFONT(t);
+	} else if (t->font < 0 ) {
+		if (psfont_text(t) && t->font < -1)
+			t->font = -1;
+		else
+			t->font = 0;
+	}
 	(void)strcpy(t->cstring, buf);
 	if (t->size == 0) t->size = 18;
 	return(t);