diff --git a/src/hb-ot-shape-complex-use-machine.hh b/src/hb-ot-shape-complex-use-machine.hh
index c8d24c516..144e7d3a4 100644
--- a/src/hb-ot-shape-complex-use-machine.hh
+++ b/src/hb-ot-shape-complex-use-machine.hh
@@ -348,7 +348,7 @@ find_syllables_use (hb_buffer_t *buffer)
   auto eof = +pe;
   auto ts = +p;
   auto te = +p;
-  unsigned int act;
+  unsigned int act HB_UNUSED;
   int cs;
   
 #line 355 "hb-ot-shape-complex-use-machine.hh"
diff --git a/src/hb-ot-shape-complex-use-machine.rl b/src/hb-ot-shape-complex-use-machine.rl
index da8e4a27b..364ba0d1b 100644
--- a/src/hb-ot-shape-complex-use-machine.rl
+++ b/src/hb-ot-shape-complex-use-machine.rl
@@ -190,7 +190,7 @@ find_syllables_use (hb_buffer_t *buffer)
   auto eof = +pe;
   auto ts = +p;
   auto te = +p;
-  unsigned int act;
+  unsigned int act HB_UNUSED;
   int cs;
   %%{
     write init;