diff --git a/Makefile b/Makefile
index 5ee707a0a..cb2b705e1 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,6 @@ PDF_JS_FILES = \
   charsets.js \
   cidmaps.js \
   colorspace.js \
-  core.js \
   crypto.js \
   evaluator.js \
   fonts.js \