diff --git a/scripts/build.sh b/scripts/build.sh
index 6d89232..8a41d1c 100644
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -4,7 +4,7 @@ CFLAGS="$CFLAGS -std=c11 -pedantic -Wall -Wextra"
 CFLAGS="$CFLAGS -fsanitize=address,undefined"
 CFLAGS="$CFLAGS -O0 -ggdb"
 
-mkdir -p build
+if [ ! -e build ]; then mkdir build; else rm build/*; fi
 
 # Build library
 clang $CFLAGS -Ilib -c lib/parse.c -o build/parse.o