diff --git a/snakemake/sourcecache.py b/snakemake/sourcecache.py
index 36e7a9949..9b0c839d9 100644
--- a/snakemake/sourcecache.py
+++ b/snakemake/sourcecache.py
@@ -284,8 +284,11 @@ def __init__(self, runtime_cache_path=None):
         )
         os.makedirs(self.cache, exist_ok=True)
         if runtime_cache_path is None:
+            runtime_cache_parent = self.cache / "runtime-cache"
+            os.makedirs(runtime_cache_parent, exist_ok=True)
             self.runtime_cache = tempfile.TemporaryDirectory(
-                suffix="snakemake-runtime-source-cache"
+                suffix="snakemake-runtime-source-cache",
+                dir=runtime_cache_parent,
             )
             self._runtime_cache_path = None
         else: