diff --git a/src/OT/Layout/Common/Coverage.hh b/src/OT/Layout/Common/Coverage.hh
index e52a617c8..eef89a287 100644
--- a/src/OT/Layout/Common/Coverage.hh
+++ b/src/OT/Layout/Common/Coverage.hh
@@ -206,7 +206,7 @@ struct Coverage
 
   template <typename IterableOut,
 	    hb_requires (hb_is_sink_of (IterableOut, hb_codepoint_t))>
-  void intersect_set (const hb_set_t &glyphs, IterableOut &intersect_glyphs) const
+  void intersect_set (const hb_set_t &glyphs, IterableOut&& intersect_glyphs) const
   {
     switch (u.format)
     {
diff --git a/src/OT/Layout/Common/CoverageFormat1.hh b/src/OT/Layout/Common/CoverageFormat1.hh
index 886babd2d..82fd48dc5 100644
--- a/src/OT/Layout/Common/CoverageFormat1.hh
+++ b/src/OT/Layout/Common/CoverageFormat1.hh
@@ -88,7 +88,7 @@ struct CoverageFormat1_3
 
   template <typename IterableOut,
 	    hb_requires (hb_is_sink_of (IterableOut, hb_codepoint_t))>
-  void intersect_set (const hb_set_t &glyphs, IterableOut &intersect_glyphs) const
+  void intersect_set (const hb_set_t &glyphs, IterableOut&& intersect_glyphs) const
   {
     unsigned count = glyphArray.len;
     for (unsigned i = 0; i < count; i++)
diff --git a/src/OT/Layout/Common/CoverageFormat2.hh b/src/OT/Layout/Common/CoverageFormat2.hh
index 4ddb2a73e..974d09463 100644
--- a/src/OT/Layout/Common/CoverageFormat2.hh
+++ b/src/OT/Layout/Common/CoverageFormat2.hh
@@ -140,7 +140,7 @@ struct CoverageFormat2_4
 
   template <typename IterableOut,
 	    hb_requires (hb_is_sink_of (IterableOut, hb_codepoint_t))>
-  void intersect_set (const hb_set_t &glyphs, IterableOut &intersect_glyphs) const
+  void intersect_set (const hb_set_t &glyphs, IterableOut&& intersect_glyphs) const
   {
     for (const auto& range : rangeRecord)
     {
diff --git a/src/OT/glyf/glyf-helpers.hh b/src/OT/glyf/glyf-helpers.hh
index f51f7a81f..181c33d06 100644
--- a/src/OT/glyf/glyf-helpers.hh
+++ b/src/OT/glyf/glyf-helpers.hh
@@ -16,7 +16,7 @@ template<typename IteratorIn, typename IteratorOut,
 	 hb_requires (hb_is_source_of (IteratorIn, unsigned int)),
 	 hb_requires (hb_is_sink_of (IteratorOut, unsigned))>
 static void
-_write_loca (IteratorIn it, bool short_offsets, IteratorOut dest)
+_write_loca (IteratorIn&& it, bool short_offsets, IteratorOut&& dest)
 {
   unsigned right_shift = short_offsets ? 1 : 0;
   unsigned int offset = 0;