diff --git a/src/libsodium/include/sodium/private/ed25519_ref10_fe_25_5.h b/src/libsodium/include/sodium/private/ed25519_ref10_fe_25_5.h
index 3cd221a5..4652f0db 100644
--- a/src/libsodium/include/sodium/private/ed25519_ref10_fe_25_5.h
+++ b/src/libsodium/include/sodium/private/ed25519_ref10_fe_25_5.h
@@ -273,7 +273,7 @@ fe25519_cswap(fe25519 f, fe25519 g, unsigned int b)
 static inline void
 fe25519_copy(fe25519 h, const fe25519 f)
 {
-    memcpy(h, f, 10 * 4);
+    memcpy(h, f, 10 * sizeof h[0]);
 }
 
 /*
diff --git a/src/libsodium/include/sodium/private/ed25519_ref10_fe_51.h b/src/libsodium/include/sodium/private/ed25519_ref10_fe_51.h
index dd94d0b8..ac4321be 100644
--- a/src/libsodium/include/sodium/private/ed25519_ref10_fe_51.h
+++ b/src/libsodium/include/sodium/private/ed25519_ref10_fe_51.h
@@ -191,7 +191,7 @@ fe25519_cswap(fe25519 f, fe25519 g, unsigned int b)
 static inline void
 fe25519_copy(fe25519 h, const fe25519 f)
 {
-    memcpy(h, f, 5 * 8);
+    memcpy(h, f, 5 * sizeof h[0]);
 }
 
 /*