diff --git a/pdfgen.c b/pdfgen.c
index 2448dae..f916161 100644
--- a/pdfgen.c
+++ b/pdfgen.c
@@ -210,12 +210,21 @@ static const char png_chunk_end[] = "IEND";
 
 // PDF standard fonts
 static const char *valid_fonts[] = {
-    "Times-Roman",       "Times-Bold",
-    "Times-Italic",      "Times-BoldItalic",
-    "Helvetica",         "Helvetica-Bold",
-    "Helvetica-Oblique", "Helvetica-BoldOblique",
-    "Courier",           "Courier-Bold",
-    "Courier-Oblique",   "Courier-BoldOblique"};
+    "Times-Roman",
+    "Times-Bold",
+    "Times-Italic",
+    "Times-BoldItalic",
+    "Helvetica",
+    "Helvetica-Bold",
+    "Helvetica-Oblique",
+    "Helvetica-BoldOblique",
+    "Courier",
+    "Courier-Bold",
+    "Courier-Oblique",
+    "Courier-BoldOblique",
+    "Symbol",
+    "ZapfDingbats",
+};
 
 typedef struct pdf_object pdf_object;
 
diff --git a/tests/massive-file.c b/tests/massive-file.c
index a5a1606..aae3011 100644
--- a/tests/massive-file.c
+++ b/tests/massive-file.c
@@ -1,4 +1,5 @@
 #include "pdfgen.h"
+#include <limits.h>
 #include <stdlib.h>
 
 int main(int argc, char **argv)
@@ -9,6 +10,10 @@ int main(int argc, char **argv)
 
     if (argc > 1) {
         pagecount = atoi(argv[1]);
+        if (pagecount < 1 || pagecount > INT_MAX) {
+            fprintf(stderr, "Invalid page count: %d\n", pagecount);
+            return 1;
+        }
     }
     pdf_set_font(pdf, "Times-Roman");
     for (int i = 0; i < pagecount; i++) {