--- a/third_party/blink/renderer/platform/wtf/stack_util.cc
+++ b/third_party/blink/renderer/platform/wtf/stack_util.cc
@@ -29,7 +29,7 @@
 // FIXME: On Mac OSX and Linux, this method cannot estimate stack size
 // correctly for the main thread.
 
-#elif defined(__GLIBC__) || BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_FREEBSD) || \
+#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_FREEBSD) || \
     BUILDFLAG(IS_FUCHSIA)
   // pthread_getattr_np() can fail if the thread is not invoked by
   // pthread_create() (e.g., the main thread of blink_unittests).
@@ -97,7 +97,7 @@
 }
 
 void* GetStackStart() {
-#if defined(__GLIBC__) || BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_FREEBSD) || \
+#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_FREEBSD) || \
     BUILDFLAG(IS_FUCHSIA)
   pthread_attr_t attr;
   int error;