diff --git a/dehydrate/test/build_dehydrate_test.sh b/dehydrate/test/build_dehydrate_test.sh
index 638cfad..9c5085d 100755
--- a/dehydrate/test/build_dehydrate_test.sh
+++ b/dehydrate/test/build_dehydrate_test.sh
@@ -2,14 +2,15 @@
 
 # Get the directory where this script is located
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+PROJECT_DIR="$( cd "$SCRIPT_DIR/.." && pwd )"
 
 cd "$SCRIPT_DIR"
 
 # Clean up old test data
 rm -rf dehydrate_test_data
 
-# Build the test program
-docker run --rm -v $(pwd):/workdir -w /workdir gitea.jde.nz/public/dropshell-build-base:latest \
+# Build the test program - mount the entire project directory to access ../output/dehydrate
+docker run --rm -v "$PROJECT_DIR":/workdir -w /workdir/test gitea.jde.nz/public/dropshell-build-base:latest \
     g++ -std=c++23 -static dehydrate_test.cpp -o dehydrate_test
 
 # Run the test