diff --git a/compiler-rt/lib/asan/asan_mapping_sparc64.h b/compiler-rt/lib/asan/asan_mapping_sparc64.h
--- a/compiler-rt/lib/asan/asan_mapping_sparc64.h
+++ b/compiler-rt/lib/asan/asan_mapping_sparc64.h
@@ -61,6 +61,7 @@
 
 namespace __asan {
 
+static inline uptr MemToShadowSize(uptr size) { return size >> SHADOW_SCALE; }
 static inline bool AddrIsInLowMem(uptr a) {
   PROFILE_ASAN_MAPPING();
   return a <= kLowMemEnd;