--- a/src/3rdparty/chromium/third_party/openh264/BUILD.gn
+++ b/src/3rdparty/chromium/third_party/openh264/BUILD.gn
@@ -45,7 +45,7 @@ config("config") {
 # MSAN builds are flaky with assembler. crbug.com/685168
 
 use_assembler = (is_win || is_mac || is_linux || is_chromeos) &&
-                (current_cpu == "x86" || current_cpu == "x64") && !is_msan
+                (current_cpu == "x64" || current_cpu == "x64") && !is_msan
 
 # This IF statement will make the targets visible only on specific builds,
 # which will lead to failures on other platforms if accidentally invoked.