diff --git a/libipt/BUILD.gn b/libipt/BUILD.gn
index eb3fe1c..e37b532 100644
--- a/libipt/BUILD.gn
+++ b/libipt/BUILD.gn
@@ -76,7 +76,7 @@
     "src/pt_version.c",
   ]
 
-  if (is_linux || is_mac) {
+  if ((is_linux || is_mac) && host_cpu == "x64") {
     sources += [
       "internal/include/posix/pt_section_posix.h",