diff --git a/include/picrin.h b/include/picrin.h
index c576b0e3..a1c32c1f 100644
--- a/include/picrin.h
+++ b/include/picrin.h
@@ -94,6 +94,7 @@ typedef struct {
   xhash macros;
   pic_value libs;
 
+  bool rfcase;
   xhash rlabels;
 
   jmp_buf *jmp;
diff --git a/src/read.c b/src/read.c
index 0d5f85e6..8c9621ee 100644
--- a/src/read.c
+++ b/src/read.c
@@ -134,13 +134,13 @@ read_directive(pic_state *pic, struct pic_port *port, int c)
   switch ((char)peek(port)) {
   case 'n':
     if (expect(port, "no-fold-case")) {
-      /* :FIXME: set no-fold-case flag */
+      pic->rfcase = false;
       return pic_undef_value();
     }
     break;
   case 'f':
     if (expect(port, "fold-case")) {
-      /* :FIXME: set fold-case flag */
+      pic->rfcase = true;
       return pic_undef_value();
     }
     break;
@@ -191,13 +191,15 @@ read_symbol(pic_state *pic, struct pic_port *port, int c)
     if (len != 0) {
       c = next(port);
     }
+    if (pic->rfcase) {
+      c = tolower(c);
+    }
     len += 1;
     buf = pic_realloc(pic, buf, len + 1);
     buf[len - 1] = (char)c;
   } while (! isdelim(peek(port)));
 
-  buf[len] = '\0';
-  sym = pic_intern_cstr(pic, buf);
+  sym = pic_intern(pic, buf, len);
   pic_free(pic, buf);
 
   return pic_sym_value(sym);
diff --git a/src/state.c b/src/state.c
index 4a6ad837..6cd6c139 100644
--- a/src/state.c
+++ b/src/state.c
@@ -59,6 +59,7 @@ pic_open(int argc, char *argv[], char **envp)
   pic->lib = NULL;
 
   /* reader */
+  pic->rfcase = false;
   xh_init_int(&pic->rlabels, sizeof(pic_value));
 
   /* error handling */