diff --git a/xkb/xkb.c b/xkb/xkb.c
index f2bcaee412ed602023d052a580090a49c2ac5433..c78aceb78f027948ef12fa5cb0ca434b936655b5 100644
--- a/xkb/xkb.c
+++ b/xkb/xkb.c
@@ -3073,6 +3073,7 @@ XkbComputeGetIndicatorMapReplySize(XkbIndicatorPtr indicators,
             nIndicators++;
     }
     rep->length = (nIndicators * SIZEOF(xkbIndicatorMapWireDesc)) / 4;
+    rep->nIndicators = nIndicators;
     return Success;
 }