diff --git a/src/libsodium/sodium/utils.c b/src/libsodium/sodium/utils.c
index a176f87a..2e3fcea8 100644
--- a/src/libsodium/sodium/utils.c
+++ b/src/libsodium/sodium/utils.c
@@ -114,7 +114,7 @@ sodium_memzero(void *const pnt, const size_t len)
     memset(pnt, 0, len);
     _sodium_dummy_symbol_to_prevent_memzero_lto(pnt, len);
 # ifdef HAVE_AMD64_ASM
-    __asm__ __volatile__ ("" : : "p"(pnt));
+    __asm__ __volatile__ ("" : : "r"(pnt) : "memory");
 # endif
 #else
     volatile unsigned char *volatile pnt_ =