diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 6f8f92e..470d377 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -393,8 +393,10 @@
 }
 
 #if defined(__clang__)
-#define __wrap_snprintf(dest, size, ...) __builtin___snprintf_chk(dest, size, 0, __bos(dest), __VA_ARGS__)
-#define snprintf(...) __wrap_snprintf(__VA_ARGS__)
+  #if !defined(snprintf)
+    #define __wrap_snprintf(dest, size, ...) __builtin___snprintf_chk(dest, size, 0, __bos(dest), __VA_ARGS__)
+    #define snprintf(...) __wrap_snprintf(__VA_ARGS__)
+  #endif
 #else
 __BIONIC_FORTIFY_INLINE
 __printflike(3, 4)
@@ -406,8 +408,10 @@
 #endif
 
 #if defined(__clang__)
-#define __wrap_sprintf(dest, ...) __builtin___sprintf_chk(dest, 0, __bos(dest), __VA_ARGS__)
-#define sprintf(...) __wrap_sprintf(__VA_ARGS__)
+  #if !defined(sprintf)
+    #define __wrap_sprintf(dest, ...) __builtin___sprintf_chk(dest, 0, __bos(dest), __VA_ARGS__)
+    #define sprintf(...) __wrap_sprintf(__VA_ARGS__)
+  #endif
 #else
 __BIONIC_FORTIFY_INLINE
 __printflike(2, 3)