3 files changed, 12 insertions, 10 deletions
diff --git a/include/mrbconf.h b/include/mrbconf.h
index cabc10b4f..275cdf4c1 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -110,8 +110,10 @@ typedef short mrb_sym;
 # define strtoll _strtoi64
 # define PRId32 "I32d"
 # define PRId64 "I64d"
+typedef unsigned int mrb_bool;
 #else
 # include <inttypes.h>
+typedef _Bool mrb_bool;
 #endif
 
 #ifdef ENABLE_STDIO
diff --git a/include/mruby.h b/include/mruby.h
index e058d409f..c5f359bd8 100644
--- a/include/mruby.h
+++ b/include/mruby.h
@@ -121,9 +121,9 @@ typedef struct mrb_state {
   size_t gc_threshold;
   int gc_interval_ratio;
   int gc_step_ratio;
-  unsigned int gc_disabled:1;
-  unsigned int gc_full:1;
-  unsigned int is_generational_gc_mode:1;
+  mrb_bool gc_disabled:1;
+  mrb_bool gc_full:1;
+  mrb_bool is_generational_gc_mode:1;
   size_t majorgc_old_threshold;
   struct alloca_header *mems;
 
diff --git a/include/mruby/compile.h b/include/mruby/compile.h
index 2cbc28321..a50c85e42 100644
--- a/include/mruby/compile.h
+++ b/include/mruby/compile.h
@@ -21,9 +21,9 @@ typedef struct mrbc_context {
   int slen;
   char *filename;
   short lineno;
-  int capture_errors:1;
-  int dump_result:1;
-  int no_exec:1;
+  mrb_bool capture_errors:1;
+  mrb_bool dump_result:1;
+  mrb_bool no_exec:1;
 } mrbc_context;
 
 mrbc_context* mrbc_context_new(mrb_state *mrb);
@@ -67,8 +67,8 @@ enum heredoc_type {
 /* heredoc structure */
 struct mrb_parser_heredoc_info {
   enum heredoc_type type;
-  int allow_indent:1;
-  int line_head:1;
+  mrb_bool allow_indent:1;
+  mrb_bool line_head:1;
   const char *term;
   int term_len;
   mrb_ast_node *doc;
@@ -102,8 +102,8 @@ struct mrb_parser_state {
 
   mrb_ast_node *heredocs;	/* list of mrb_parser_heredoc_info* */
   mrb_ast_node *parsing_heredoc;
-  int heredoc_starts_nextline:1;
-  int heredoc_end_now:1;	/* for mirb */
+  mrb_bool heredoc_starts_nextline:1;
+  mrb_bool heredoc_end_now:1; /* for mirb */
 
   void *ylval;