diff --git a/tcc.c b/tcc.c
index d3739808..94def682 100644
--- a/tcc.c
+++ b/tcc.c
@@ -344,7 +344,7 @@ int main(int argc, char **argv)
                         tcc_parse_args(s, argc - 1, argv + 1);
                         tcc_set_environment(s);
                         if (s->output_type != TCC_OUTPUT_OBJ)
-                            tcc_error("interlnal error");
+                            tcc_error("internal error");
                         tcc_set_output_type(s, s->output_type);
                     }
                 }
diff --git a/tccpp.c b/tccpp.c
index b892b2e9..603a65e8 100644
--- a/tccpp.c
+++ b/tccpp.c
@@ -1471,8 +1471,11 @@ static void pragma_parse(TCCState *s1)
             tcc_warning("unbalanced #pragma pop_macro");
 
     } else if (tok == TOK_once) {
-        add_cached_include(s1, file->filename, TOK_once);
+        char buf1[sizeof file->filename];
 
+        pstrcpy(buf1, sizeof(buf1), "#once#");
+        pstrcat(buf1, sizeof(buf1), file->filename);
+        add_cached_include(s1, file->filename, tok_alloc(buf1, strlen(buf1))->tok);
     } else if (s1->ppfp) {
         /* tcc -E: keep pragmas below unchanged */
         unget_tok(' ');
@@ -1670,7 +1673,7 @@ ST_FUNC void preprocess(int is_bof)
 
             pstrcat(buf1, sizeof(buf1), buf);
             e = search_cached_include(s1, buf1);
-            if (e && (define_find(e->ifndef_macro) || e->ifndef_macro == TOK_once)) {
+            if (e && define_find(e->ifndef_macro)) {
                 /* no need to parse the include because the 'ifndef macro'
                    is defined */
 #ifdef INC_DEBUG