diff --git a/etc.c b/etc.c
index 0c3a004..4e662e4 100644
--- a/etc.c
+++ b/etc.c
@@ -2024,7 +2024,7 @@ base64_encode(const unsigned char *src, size_t len)
     if (k + 1 < len)
 	return NULL;
 
-    w = GC_MALLOC_ATOMIC(k + 1);
+    w = GC_MALLOC_ATOMIC_IGNORE_OFF_PAGE(k + 1);
     w[k] = 0;
 
     at = w;