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-rw-r--r--libio/Makefile6
1 files changed, 3 insertions, 3 deletions
diff --git a/libio/Makefile b/libio/Makefile
index 02efe1b3a3..c555dd0004 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -70,14 +70,14 @@ routines += oldiofopen oldiofdopen oldiofclose oldiopopen oldpclose \
 	    oldiofsetpos64
 endif
 
-ifneq (,$(filter %REENTRANT, $(defines)))
+ifeq (yes,$(libc-reentrant))
 routines += clearerr_u feof_u ferror_u fputc_u getc_u getchar_u		      \
 	    iofflush_u putc_u putchar_u peekc iofread_u iofwrite_u iofgets_u  \
 	    iofputs_u
-
-CPPFLAGS += -D_IO_MTSAFE_IO
 endif
 
+CPPFLAGS += $(libio-mtsafe)
+
 # Support for exception handling.
 CFLAGS-fileops.c = $(exceptions)
 CFLAGS-fputc.c = $(exceptions)