diff --git a/test/default/sodium_utils2.c b/test/default/sodium_utils2.c
index e0d4895f..dc3a7a0b 100644
--- a/test/default/sodium_utils2.c
+++ b/test/default/sodium_utils2.c
@@ -67,10 +67,11 @@ int main(void)
     buf = sodium_malloc(size);
     sodium_mprotect_readonly(buf);
     sodium_mprotect_readwrite(buf);
+#ifndef __EMSCRIPTEN__
     sodium_memzero(((unsigned char *)buf) + size, 1U);
     sodium_mprotect_noaccess(buf);
     sodium_free(buf);
     printf("Overflow not caught\n");
-
+#endif
     return 0;
 }
diff --git a/test/default/sodium_utils3.c b/test/default/sodium_utils3.c
index 67fdb31e..5a8344f2 100644
--- a/test/default/sodium_utils3.c
+++ b/test/default/sodium_utils3.c
@@ -45,10 +45,11 @@ int main(void)
     buf = sodium_malloc(size);
     sodium_mprotect_noaccess(buf);
     sodium_mprotect_readwrite(buf);
+#ifndef __EMSCRIPTEN__
     sodium_memzero(((unsigned char *)buf) - 8, 8U);
     sodium_mprotect_readonly(buf);
     sodium_free(buf);
     printf("Underflow not caught\n");
-
+#endif
     return 0;
 }