diff --git a/build.sh b/build.sh
index 3a892aa..e70f23c 100755
--- a/build.sh
+++ b/build.sh
@@ -4,7 +4,7 @@ set -xe
 
 CC="gcc"
 FLAGS="-Wall -Wpedantic"
-SRCS="cdo.c"
+SRCS="$(find ./src -type f -name "*.c")"
 CURRENT_DIR="$(git rev-parse --show-toplevel)"
 BUILD_DIR="${CURRENT_DIR}/build"
 
diff --git a/cdo.c b/src/cdo.c
similarity index 100%
rename from cdo.c
rename to src/cdo.c