1 files changed, 0 insertions, 1 deletions
diff --git a/pdfium.gyp b/pdfium.gyp
index 6bc8709a17..14d18e1499 100644
--- a/pdfium.gyp
+++ b/pdfium.gyp
@@ -22,7 +22,6 @@
     'defines' : [
       'OPJ_STATIC',
       'PNG_PREFIX',
-      'PNGPREFIX_H',
       'PNG_USE_READ_MACROS',
       'V8_DEPRECATION_WARNINGS',
       '_CRT_SECURE_NO_WARNINGS',