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-rw-r--r--stdio-common/Makefile6
1 files changed, 6 insertions, 0 deletions
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 8c7bae9c45..e65ff70713 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -50,3 +50,9 @@ include ../Rules
 
 CFLAGS-_itoa.c = -Wno-unused
 CFLAGS-tst-printf.c = -Wno-format
+
+ifeq ($(stdio),libio)
+ifneq (,$(filter %REENTRANT, $(defines)))
+CPPFLAGS += -D_IO_MTSAFE_IO
+endif
+endif