diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index 7704e4017d..e4629b837d 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -769,7 +769,7 @@ static int probe_access_internal(CPUArchState *env, vaddr addr,
         if (page_flags & acc_flag) {
             if (access_type != MMU_INST_FETCH
                 && cpu_plugin_mem_cbs_enabled(env_cpu(env))) {
-                return TLB_MMIO;
+                return TLB_FORCE_SLOW;
             }
             return 0; /* success */
         }
@@ -804,7 +804,7 @@ void *probe_access(CPUArchState *env, vaddr addr, int size,
 
     g_assert(-(addr | TARGET_PAGE_MASK) >= size);
     flags = probe_access_internal(env, addr, size, access_type, false, ra);
-    g_assert((flags & ~TLB_MMIO) == 0);
+    g_assert((flags & ~TLB_FORCE_SLOW) == 0);
 
     return size ? g2h_vaddr(env_cpu(env), addr) : NULL;
 }
diff --git a/include/exec/tlb-flags.h b/include/exec/tlb-flags.h
index 357e79095c..e12cddf234 100644
--- a/include/exec/tlb-flags.h
+++ b/include/exec/tlb-flags.h
@@ -27,12 +27,13 @@
 
 /*
  * Allow some level of source compatibility with softmmu.
- * Invalid is set when the page does not have requested permissions.
- * MMIO is set when we want the target helper to use the functional
+ * INVALID is set when the page does not have requested permissions.
+ * FORCE_SLOW is set when we want the target helper to use the functional
  * interface for load/store so that plugins see the access.
  */
 #define TLB_INVALID_MASK     (1 << 0)
-#define TLB_MMIO             (1 << 1)
+#define TLB_FORCE_SLOW       (1 << 1)
+#define TLB_MMIO             0
 #define TLB_WATCHPOINT       0
 
 #else