set bit field for mrb_bool

2 files changed, 2 insertions, 2 deletions

diff --git a/src/string.c b/src/string.c
index 3d3f084ca..dff8de90f 100644
--- a/src/string.c
+++ b/src/string.c
@@ -41,7 +41,7 @@
 const char mrb_digitmap[] = "0123456789abcdefghijklmnopqrstuvwxyz";
 
 typedef struct mrb_shared_string {
-  mrb_bool nofree;
+  mrb_bool nofree : 1;
   int refcnt;
   char *ptr;
   mrb_int len;
diff --git a/src/symbol.c b/src/symbol.c
index 95e8ed290..937d7d6ab 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;