diff --git a/test/scripts/config b/test/scripts/config
index 9ba0ce3..01a6021 100644
--- a/test/scripts/config
+++ b/test/scripts/config
@@ -13,7 +13,7 @@ else
     COMPILER=heptc.byte
 fi
 
-HEPTC=../$COMPILER_DIR/$COMPILER
+HEPTC="../$COMPILER_DIR/$COMPILER -stdlib ../../lib"
 CC="gcc -std=c99 -I ../../../lib/c"
 LD="gcc"
 NBSTEP=100