diff --git a/include/libunwind.h b/include/libunwind.h
index 9d72d48..fef72bf 100644
--- a/include/libunwind.h
+++ b/include/libunwind.h
@@ -165,13 +165,8 @@
   UNW_X86_ECX = 1,
   UNW_X86_EDX = 2,
   UNW_X86_EBX = 3,
-#if defined(__CloudABI__) || defined(__FreeBSD__)
-  UNW_X86_ESP = 4,
-  UNW_X86_EBP = 5,
-#else
   UNW_X86_EBP = 4,
   UNW_X86_ESP = 5,
-#endif
   UNW_X86_ESI = 6,
   UNW_X86_EDI = 7
 };
diff --git a/src/Registers.hpp b/src/Registers.hpp
index 8066b80..ff57c60 100644
--- a/src/Registers.hpp
+++ b/src/Registers.hpp
@@ -122,9 +122,17 @@
     return _registers.__edx;
   case UNW_X86_EBX:
     return _registers.__ebx;
-  case UNW_X86_EBP:
-    return _registers.__ebp;
+#if !defined(__APPLE__)
   case UNW_X86_ESP:
+#else
+  case UNW_X86_EBP:
+#endif
+    return _registers.__ebp;
+#if !defined(__APPLE__)
+  case UNW_X86_EBP:
+#else
+  case UNW_X86_ESP:
+#endif
     return _registers.__esp;
   case UNW_X86_ESI:
     return _registers.__esi;
@@ -154,10 +162,18 @@
   case UNW_X86_EBX:
     _registers.__ebx = value;
     return;
+#if !defined(__APPLE__)
+  case UNW_X86_ESP:
+#else
   case UNW_X86_EBP:
+#endif
     _registers.__ebp = value;
     return;
+#if !defined(__APPLE__)
+  case UNW_X86_EBP:
+#else
   case UNW_X86_ESP:
+#endif
     _registers.__esp = value;
     return;
   case UNW_X86_ESI: