diff --git a/tools/llvmc/ConfigLexer.l b/tools/llvmc/ConfigLexer.l
index 4589d4821ab..f65428ecd66 100644
--- a/tools/llvmc/ConfigLexer.l
+++ b/tools/llvmc/ConfigLexer.l
@@ -18,7 +18,6 @@
 %option never-interactive
 %option batch
 %option noyywrap
-%option nodefault
 %option 8bit
 %option outfile="ConfigLexer.cpp"
 %option ecs