diff --git a/h_malloc.c b/h_malloc.c
index 517af02..bdd563e 100644
--- a/h_malloc.c
+++ b/h_malloc.c
@@ -1727,7 +1727,11 @@ EXPORT struct mallinfo h_mallinfo(void) {
 #endif
 
 #ifdef __GLIBC__
-EXPORT int h_malloc_info(UNUSED int options, UNUSED FILE *fp) {
+EXPORT int h_malloc_info(int options, UNUSED FILE *fp) {
+    if (options) {
+        errno = EINVAL;
+        return -1;
+    }
     errno = ENOSYS;
     return -1;
 }