diff --git a/libc/baselibc/include/stdio.h b/libc/baselibc/include/stdio.h
index d941ab4c16..adfaaf417b 100644
--- a/libc/baselibc/include/stdio.h
+++ b/libc/baselibc/include/stdio.h
@@ -97,10 +97,7 @@ __extern_inline int putchar(int c)
 #define getc(f) fgetc(f)
 #define getchar() fgetc(stdin)
 
-__extern_inline int fflush(FILE *stream)
-{
-	return 0;
-}
+__extern int fflush(FILE *stream);
 
 __extern int printf(const char *, ...);
 __extern int vprintf(const char *, va_list);
diff --git a/libc/baselibc/src/mynewt.c b/libc/baselibc/src/mynewt.c
index 99b4513357..a8f12ee7de 100644
--- a/libc/baselibc/src/mynewt.c
+++ b/libc/baselibc/src/mynewt.c
@@ -48,6 +48,12 @@ struct File *const stdin = &_stdin;
 struct File *const stdout = &_stdin;
 struct File *const stderr = &_stdin;
 
+int __attribute__((weak))
+fflush(FILE *stream)
+{
+    return 0;
+}
+
 #if MYNEWT_VAL(BASELIBC_THREAD_SAFE_HEAP_ALLOCATION)
 
 static struct os_mutex heap_mutex;