diff --git a/libunwind/src/Unwind-EHABI.cpp b/libunwind/src/Unwind-EHABI.cpp
--- a/libunwind/src/Unwind-EHABI.cpp
+++ b/libunwind/src/Unwind-EHABI.cpp
@@ -885,8 +885,10 @@
   return result;
 }
 
+#ifndef NDEBUG
+// Only used in _LIBUNWIND_TRACE_API
 static uint64_t ValueAsBitPattern(_Unwind_VRS_DataRepresentation representation,
-                                  void* valuep) {
+                                  const void* valuep) {
   uint64_t value = 0;
   switch (representation) {
     case _UVRSD_UINT32:
@@ -902,6 +904,7 @@
   }
   return value;
 }
+#endif
 
 _LIBUNWIND_EXPORT _Unwind_VRS_Result
 _Unwind_VRS_Set(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,