diff --git a/libc/Android.mk b/libc/Android.mk
index 507126e..be40da6 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -653,6 +653,7 @@
 LOCAL_SRC_FILES_64 := $(libc_upstream_openbsd_gdtoa_src_files_64)
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \
+    -fvisibility=hidden \
     -I$(LOCAL_PATH)/upstream-openbsd/android/include \
     -I$(LOCAL_PATH)/upstream-openbsd/lib/libc/include \
     -include openbsd-compat.h \
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 2c797c5..58538ff 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -65,9 +65,10 @@
 extern int posix_memalign(void **memptr, size_t alignment, size_t size);
 
 extern double atof(const char*);
-extern double strtod(const char*, char**);
-extern float strtof(const char*, char**);
-extern long double strtold(const char*, char**);
+
+extern double strtod(const char*, char**) __LIBC_ABI_PUBLIC__;
+extern float strtof(const char*, char**) __LIBC_ABI_PUBLIC__;
+extern long double strtold(const char*, char**) __LIBC_ABI_PUBLIC__;
 
 extern int atoi(const char*) __purefunc;
 extern long atol(const char*) __purefunc;
diff --git a/libc/include/sys/cdefs_elf.h b/libc/include/sys/cdefs_elf.h
index bb846b7..c21214c 100644
--- a/libc/include/sys/cdefs_elf.h
+++ b/libc/include/sys/cdefs_elf.h
@@ -61,24 +61,11 @@
 #define	__SECTIONSTRING(_sec, _str)					\
 	__asm__(".section " #_sec "\n\t.asciz \"" _str "\"\n\t.previous")
 
-/* GCC visibility helper macro */
-/* This must be used to tag non-static functions that are private, i.e.
- * never exposed by the shared library. */
-#define __LIBC_HIDDEN__							\
-	__attribute__ ((visibility ("hidden")))
+/* Used to tag non-static symbols that are private and never exposed by the shared library. */
+#define __LIBC_HIDDEN__ __attribute__((visibility ("hidden")))
 
-/* This must be used to tag non-static functions that are public, i.e.
- * exposed by the shared library, and part of the stable NDK ABI */
-#define __LIBC_ABI_PUBLIC__ \
-        __attribute__ ((visibility ("default")))
-
-/* This must be used to tag non-static functions that must be exported
- * by the shared library, but whose implementation is private to the
- * platform. For now this is equivalent to __LIBC_ABI_PUBLIC__, but we
- * may want to change this later.
- */
-#define __LIBC_ABI_PRIVATE__ \
-        __attribute__ ((visibility ("default")))
+/* Used to tag non-static symbols that are public and exposed by the shared library. */
+#define __LIBC_ABI_PUBLIC__ __attribute__((visibility ("default")))
 
 #define	__IDSTRING(_n,_s)		__SECTIONSTRING(.ident,_s)