diff --git a/nuttx/tools/mksymtab.c b/nuttx/tools/mksymtab.c
index 14101f3d9d..01404bc97a 100644
--- a/nuttx/tools/mksymtab.c
+++ b/nuttx/tools/mksymtab.c
@@ -94,16 +94,19 @@ static bool check_hdrfile(const char *hdrfile)
 
 static void add_hdrfile(const char *hdrfile)
 {
-  if (!check_hdrfile(hdrfile))
+  if (hdrfile && strlen(hdrfile) > 0)
     {
-      if (nhdrfiles > MAX_HEADER_FILES)
+      if (!check_hdrfile(hdrfile))
         {
-          fprintf(stderr, "ERROR:  Too man header files.  Increase MAX_HEADER_FILES\n");
-          exit(EXIT_FAILURE);
+          if (nhdrfiles > MAX_HEADER_FILES)
+            {
+              fprintf(stderr, "ERROR:  Too man header files.  Increase MAX_HEADER_FILES\n");
+              exit(EXIT_FAILURE);
+            }
+
+          g_hdrfiles[nhdrfiles] = strdup(hdrfile);
+          nhdrfiles++;
         }
-
-      g_hdrfiles[nhdrfiles] = strdup(hdrfile);
-      nhdrfiles++;
     }
 }