diff --git a/libyuv.gyp b/libyuv.gyp
index 3f06d4193..d4ad43908 100644
--- a/libyuv.gyp
+++ b/libyuv.gyp
@@ -122,6 +122,9 @@
           'dependencies': [
             'libyuv_neon',
           ],
+          'defines': [
+            'LIBYUV_NEON',
+          ],
         }],
         # MemorySanitizer does not support assembly code yet.
         # http://crbug.com/344505