1 files changed, 1 insertions, 1 deletions
diff --git a/src/symbol.c b/src/symbol.c
index cc99c15fc..f2ead15ff 100644
--- a/src/symbol.c
+++ b/src/symbol.c
@@ -12,7 +12,7 @@
 
 /* ------------------------------------------------------ */
 typedef struct symbol_name {
-  mrb_bool lit;
+  mrb_bool lit : 1;
   uint16_t len;
   const char *name;
 } symbol_name;