diff --git a/src/archutils/Unix/Backtrace.h b/src/archutils/Unix/Backtrace.h
index fa2b74b0a7..51c3c9b838 100644
--- a/src/archutils/Unix/Backtrace.h
+++ b/src/archutils/Unix/Backtrace.h
@@ -42,7 +42,7 @@ bool GetThreadBacktraceContext( uint64_t ThreadID, BacktraceContext *ctx );
 
 /* Set up a BacktraceContext to get a backtrace after receiving a signal, given
  * a ucontext_t (see sigaction(2)).  (This interface is UNIX-specific.) */
-#if defined(UNIX)
+#if defined(UNIX) || defined(MACOSX)
 #include <ucontext.h>
 void GetSignalBacktraceContext( BacktraceContext *ctx, const ucontext_t *uc );
 #endif