diff --git a/lwlib/Makefile.in b/lwlib/Makefile.in
index be96edc0a1c..31d8ea7d3c9 100644
--- a/lwlib/Makefile.in
+++ b/lwlib/Makefile.in
@@ -37,7 +37,7 @@ TOOLKIT_DEFINES = -DUSE_$(USE_X_TOOLKIT)
 
 ALL_CFLAGS= $(C_SWITCH_SITE) $(C_SWITCH_SYSTEM) $(C_SWITCH_X_SITE) \
   $(C_SWITCH_X_SYSTEM) $(C_SWITCH_MACHINE) $(CPPFLAGS) $(CFLAGS) \
-  -DEMACS_BITMAP_FILES -DTHIS_IS_X11R4 -Demacs
+  -DEMACS_BITMAP_FILES -Demacs
 
 .c.o:
 	$(CC) -c ${ALL_CFLAGS} $<