diff --git a/setup.py b/setup.py
index 57337621e..4aa91dba8 100755
--- a/setup.py
+++ b/setup.py
@@ -9,6 +9,7 @@
 from pathlib import Path
 import re
 import shlex
+import shutil
 import subprocess
 import sys
 import sysconfig
@@ -261,9 +262,14 @@ def run(self):
         import urllib.error
 
         from vmtest.config import ARCHITECTURES, Kernel, local_kernel
-        from vmtest.download import DownloadCompiler, DownloadKernel, download_in_thread
+        from vmtest.download import (
+            IN_GITHUB_ACTIONS,
+            DownloadCompiler,
+            DownloadKernel,
+            download_in_thread,
+        )
 
-        if os.getenv("GITHUB_ACTIONS") == "true":
+        if IN_GITHUB_ACTIONS:
 
             @contextlib.contextmanager
             def github_workflow_group(title):
@@ -334,6 +340,12 @@ def github_workflow_group(title):
                         logger.info("Passed: %s", ", ".join(passed))
                     if failed:
                         logger.error("Failed: %s", ", ".join(failed))
+
+                    # Github Actions has limited disk space. Once tested, we
+                    # will not use the kernel again, so delete it.
+                    if IN_GITHUB_ACTIONS:
+                        logger.info("Deleting kernel %s", kernel.release)
+                        shutil.rmtree(kernel.path)
         except urllib.error.HTTPError as e:
             if e.code == 403:
                 print(e, file=sys.stderr)
diff --git a/vmtest/download.py b/vmtest/download.py
index 1ba8b9045..81d99a79b 100644
--- a/vmtest/download.py
+++ b/vmtest/download.py
@@ -42,6 +42,8 @@
 
 logger = logging.getLogger(__name__)
 
+IN_GITHUB_ACTIONS = os.getenv("GITHUB_ACTIONS") == "true"
+
 COMPILER_URL = "https://mirrors.kernel.org/pub/tools/crosstool/"
 VMTEST_GITHUB_RELEASE = ("osandov", "drgn", "vmtest-assets")
 
@@ -286,7 +288,12 @@ def _download_thread(
 def download_in_thread(
     download_dir: Path, downloads: Iterable[Download]
 ) -> Generator[Iterator[Downloaded], None, None]:
-    q: "queue.Queue[Union[Downloaded, Exception]]" = queue.Queue()
+    # Downloading too many files before they can be used for testing runs the
+    # risk of filling up the limited disk space is Github Actions. Set a limit
+    # of no more than 5 files which can be downloaded ahead of time. This is a
+    # magic number with no testing, but should work.
+    maxsize = 5 if IN_GITHUB_ACTIONS else 0
+    q: "queue.Queue[Union[Downloaded, Exception]]" = queue.Queue(maxsize)
 
     def aux() -> Iterator[Downloaded]:
         while True: