diff --git a/quickjs.c b/quickjs.c
index a61bfe2..fe774fb 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -1388,6 +1388,12 @@ void *js_realloc_rt(JSRuntime *rt, void *ptr, size_t size)
     return rt->mf.js_realloc(&rt->malloc_state, ptr, size);
 }
 
+static void *js_dbuf_realloc(void *opaque, void *ptr, size_t size)
+{
+    JSRuntime *rt = opaque;
+    return js_realloc_rt(rt, ptr, size);
+}
+
 size_t js_malloc_usable_size_rt(JSRuntime *rt, const void *ptr)
 {
     return rt->mf.js_malloc_usable_size(ptr);
@@ -1517,7 +1523,7 @@ static inline int js_resize_array(JSContext *ctx, void **parray, int elem_size,
 
 static inline void js_dbuf_init(JSContext *ctx, DynBuf *s)
 {
-    dbuf_init2(s, ctx->rt, (DynBufReallocFunc *)js_realloc_rt);
+    dbuf_init2(s, ctx->rt, js_dbuf_realloc);
 }
 
 static inline int is_digit(int c) {