diff --git a/litecross/Makefile b/litecross/Makefile
index a3431b2..cfe3fae 100644
--- a/litecross/Makefile
+++ b/litecross/Makefile
@@ -53,7 +53,7 @@ endif
 
 MAKE += MULTILIB_OSDIRNAMES=
 MAKE += INFO_DEPS= infodir=
-MAKE += ac_cv_prog_lex_root=lex.yy.c
+MAKE += ac_cv_prog_lex_root=lex.yy
 MAKE += MAKEINFO=false
 
 FULL_BINUTILS_CONFIG = \