--- base/trace_event/malloc_dump_provider.cc
+++ base/trace_event/malloc_dump_provider.cc
@@ -132,7 +132,7 @@
   }
 #elif defined(OS_FUCHSIA)
 // TODO(fuchsia): Port, see https://crbug.com/706592.
-#else
+#elif defined(__GLIBC__)
   struct mallinfo info = mallinfo();
 #if !defined(ADDRESS_SANITIZER) && !defined(THREAD_SANITIZER)
   // Sanitizers override mallinfo.
--- base/process/process_metrics_posix.cc
+++ base/process/process_metrics_posix.cc
@@ -110,17 +110,16 @@
   malloc_statistics_t stats = {0};
   malloc_zone_statistics(nullptr, &stats);
   return stats.size_in_use;
-#elif defined(OS_LINUX) || defined(OS_ANDROID)
+#elif defined(__GLIBC__) || defined(OS_ANDROID)
   struct mallinfo minfo = mallinfo();
 #if BUILDFLAG(USE_TCMALLOC)
   return minfo.uordblks;
 #else
   return minfo.hblkhd + minfo.arena;
 #endif
-#elif defined(OS_FUCHSIA)
+#endif
   // TODO(fuchsia): Not currently exposed. https://crbug.com/735087.
   return 0;
-#endif
 }
 
 }  // namespace base