diff --git a/src/mesa/Makefile.sources b/src/mesa/Makefile.sources
index 16bd1342734..7122304dd40 100644
--- a/src/mesa/Makefile.sources
+++ b/src/mesa/Makefile.sources
@@ -221,6 +221,7 @@ MAIN_FILES = \
 	main/texcompress_rgtc.h \
 	main/texcompress_s3tc.c \
 	main/texcompress_s3tc.h \
+	main/texcompress_s3tc_tmp.h \
 	main/texenv.c \
 	main/texenv.h \
 	main/texenvprogram.h \