diff --git a/Source/Makefile.in b/Source/Makefile.in
index 1a969b9a1..41182df23 100644
--- a/Source/Makefile.in
+++ b/Source/Makefile.in
@@ -366,7 +366,6 @@ Foundation/NSProcessInfo.h \
 Foundation/NSRange.h \
 Foundation/NSSerialization.h \
 Foundation/NSString.h \
-Foundation/NSTimeZone.h \
 Foundation/NSUnarchiver.h \
 Foundation/NSUtilities.h \
 Foundation/NSValue.h \