diff --git a/libc/malloc_debug/BacktraceData.cpp b/libc/malloc_debug/BacktraceData.cpp
index 65ae6fa..d597280 100644
--- a/libc/malloc_debug/BacktraceData.cpp
+++ b/libc/malloc_debug/BacktraceData.cpp
@@ -53,7 +53,7 @@
     : OptionData(debug_data) {
   size_t hdr_len = sizeof(BacktraceHeader) + sizeof(uintptr_t) * config.backtrace_frames();
   alloc_offset_ = *offset;
-  *offset += BIONIC_ALIGN(hdr_len, MINIMUM_ALIGNMENT_BYTES);
+  *offset += __BIONIC_ALIGN(hdr_len, MINIMUM_ALIGNMENT_BYTES);
 }
 
 bool BacktraceData::Initialize(const Config& config) {