diff --git a/include/backtrace/Backtrace.h b/include/backtrace/Backtrace.h
index 561dfeb..e07d322 100644
--- a/include/backtrace/Backtrace.h
+++ b/include/backtrace/Backtrace.h
@@ -19,7 +19,6 @@
 
 #include <inttypes.h>
 #include <stdint.h>
-#include <ucontext.h>
 
 #include <string>
 #include <vector>
@@ -48,6 +47,14 @@
 // Forward declarations.
 class BacktraceImpl;
 
+#if defined(__APPLE__)
+struct __darwin_ucontext;
+typedef __darwin_ucontext ucontext_t;
+#else
+struct ucontext;
+typedef ucontext ucontext_t;
+#endif
+
 class Backtrace {
 public:
   // Create the correct Backtrace object based on what is to be unwound.