diff --git a/tests/run-test.sh b/tests/run-test.sh
index 111b47e..0e9f398 100755
--- a/tests/run-test.sh
+++ b/tests/run-test.sh
@@ -108,7 +108,7 @@ compare_with_target() {
   do_in_pod import -window root -crop $CROP out.png
   podman cp "${POD}":/home/gnomeshell/out.png "${WORK_DIR}/out.png"
 
-  DIFF=$(compare "${WORK_DIR}/out.png" ${1} -metric NCC "${WORK_DIR}/diff.png" 2>&1) || true
+  DIFF=$(compare "${WORK_DIR}/out.png" "${1}" -metric NCC "${WORK_DIR}/diff.png" 2>&1) || true
 
   if (( $(echo "$DIFF < 0.9" |bc -l) )); then
     fail "${2}"