diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6608a94..31fa175 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,5 +31,5 @@ jobs:
         flags: --recursive
     - name: Check recursive prerequisites
       run: |
-        test "${{ steps.recursive-prerequisites.outputs.prerequisites }}" = "preprereq"
+        test "${{ steps.recursive-prerequisites.outputs.prerequisites }}" = "preprereq1 preprereq2"
         echo ${{ steps.recursive-prerequisites.outputs.hash }}
diff --git a/action.yml b/action.yml
index 504f3e0..6c1d890 100644
--- a/action.yml
+++ b/action.yml
@@ -35,6 +35,6 @@ runs:
       working-directory: ${{ inputs.working-directory }}
       run: |
         hash=$(${GITHUB_ACTION_PATH}/list-make-prerequisites.py ${{ inputs.target }} ${{ inputs.flags }} --hash 2>/dev/null)
-        prerequisites=$(${GITHUB_ACTION_PATH}/list-make-prerequisites.py ${{ inputs.target }} ${{ inputs.flags }} 2>/dev/null)
+        prerequisites=$(${GITHUB_ACTION_PATH}/list-make-prerequisites.py ${{ inputs.target }} ${{ inputs.flags }} 2>/dev/null | xargs)
         echo "hash=$hash" >> $GITHUB_OUTPUT
         echo "prerequisites=$prerequisites" >> $GITHUB_OUTPUT
diff --git a/test/Makefile b/test/Makefile
index 7af0dc8..750deca 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,5 +1,6 @@
 test: prereq
 	cp $< $@
 
-prereq: preprereq
+prereq: preprereq1 preprereq2
 	cp $< $@
+	cat preprereq2 >> $@
diff --git a/test/preprereq b/test/preprereq
deleted file mode 100644
index 08e00ed..0000000
--- a/test/preprereq
+++ /dev/null
@@ -1 +0,0 @@
-Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
\ No newline at end of file
diff --git a/test/preprereq1 b/test/preprereq1
new file mode 100644
index 0000000..0e26918
--- /dev/null
+++ b/test/preprereq1
@@ -0,0 +1 @@
+preprereq1
\ No newline at end of file
diff --git a/test/preprereq2 b/test/preprereq2
new file mode 100644
index 0000000..4995b5b
--- /dev/null
+++ b/test/preprereq2
@@ -0,0 +1 @@
+preprereq2
\ No newline at end of file