diff --git a/compiler-rt/lib/asan/asan_mapping.h b/compiler-rt/lib/asan/asan_mapping.h
index 1fecaeb35e1e..b097f841f4f5 100644
--- a/compiler-rt/lib/asan/asan_mapping.h
+++ b/compiler-rt/lib/asan/asan_mapping.h
@@ -65,8 +65,8 @@ static const u64 kPPC64_ShadowOffset64 = 1ULL << 41;
 static const u64 kMIPS32_ShadowOffset32 = 0x0aaa8000;
 
 #if ASAN_FLEXIBLE_MAPPING_AND_OFFSET == 1
-extern SANITIZER_INTERFACE_ATTRIBUTE uptr __asan_mapping_scale;
-extern SANITIZER_INTERFACE_ATTRIBUTE uptr __asan_mapping_offset;
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE uptr __asan_mapping_scale;
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE uptr __asan_mapping_offset;
 # define SHADOW_SCALE (__asan_mapping_scale)
 # define SHADOW_OFFSET (__asan_mapping_offset)
 #else