diff --git a/libunwind/src/config.h b/libunwind/src/config.h
index b14e591ba425..69f5cc1df0a9 100644
--- a/libunwind/src/config.h
+++ b/libunwind/src/config.h
@@ -86,11 +86,14 @@
   #endif
 #endif
 
-#define _LIBUNWIND_BUILD_ZERO_COST_APIS                                        \
-  (defined(__i386__) || defined(__x86_64__) ||                                 \
-   (!defined(__APPLE__) && defined(__arm__)) ||                                \
-   (defined(__arm64__) || defined(__aarch64__)) ||                             \
-   (defined(__APPLE__) && defined(__mips__)))
+#if defined(__i386__) || defined(__x86_64__) ||                                \
+    (!defined(__APPLE__) && defined(__arm__)) ||                               \
+    (defined(__arm64__) || defined(__aarch64__)) ||                            \
+    (defined(__APPLE__) && defined(__mips__))
+#define _LIBUNWIND_BUILD_ZERO_COST_APIS 1
+#else
+#define _LIBUNWIND_BUILD_ZERO_COST_APIS 0
+#endif
 
 // Macros that define away in non-Debug builds
 #ifdef NDEBUG