diff --git a/nac3standalone/demo/run_demo.sh b/nac3standalone/demo/run_demo.sh
index d0f03db3..5151e930 100755
--- a/nac3standalone/demo/run_demo.sh
+++ b/nac3standalone/demo/run_demo.sh
@@ -9,5 +9,5 @@ fi
 
 rm -f *.o
 ../../target/release/nac3standalone $1
-clang -Wall -O2 -o $1.elf demo.c module*.o
+clang -Wall -O2 -o $1.elf demo.c module*.o -lm
 ./$1.elf