diff --git a/modules/rules_nixpkgs_core/0.10.0/patches/debug.patch b/modules/rules_nixpkgs_core/0.10.0/patches/debug.patch
new file mode 100644
index 00000000000..70510591ebf
--- /dev/null
+++ b/modules/rules_nixpkgs_core/0.10.0/patches/debug.patch
@@ -0,0 +1,22 @@
+diff --git a/core/util.bzl b/core/util.bzl
+index 804892a..52ab5c4 100644
+--- a/core/util.bzl
++++ b/core/util.bzl
+@@ -23,7 +23,17 @@ def fail_on_err(return_value, prefix = None):
+ 
+     return result
+ 
++def _ls(repository_ctx, path):
++    result = repository_ctx.execute(["ls", path])
++    print(path, "\nSTDOUT\n", result.stdout, "\nSTDERR\n", result.stderr, "\nCODE\n", result.return_code)
++
+ def is_supported_platform(repository_ctx):
++    print("PATH", repository_ctx.os.environ.get("PATH", ""))
++    print("HOME", repository_ctx.os.environ.get("HOME", ""))
++    home = repository_ctx.os.environ.get("HOME", "")
++    _ls(repository_ctx, home + "/.nix-profile/bin")
++    _ls(repository_ctx, "/nix/var/nix/profiles/default/bin")
++    _ls(repository_ctx, "/nix/var/nix/profiles")
+     return repository_ctx.which("nix-build") != None
+ 
+ def _is_executable(repository_ctx, path):
diff --git a/modules/rules_nixpkgs_core/0.10.0/source.json b/modules/rules_nixpkgs_core/0.10.0/source.json
index e864281a8de..59bdfed1606 100644
--- a/modules/rules_nixpkgs_core/0.10.0/source.json
+++ b/modules/rules_nixpkgs_core/0.10.0/source.json
@@ -1,5 +1,9 @@
 {
   "integrity": "sha256-mA7fzu8uWeESLZvmxSQTvCmENfCj1FJTK4pI11Yv/Wc=",
   "strip_prefix": "rules_nixpkgs-0.10.0/core",
-  "url": "https://github.com/tweag/rules_nixpkgs/releases/download/v0.10.0/rules_nixpkgs-0.10.0.tar.gz"
+  "url": "https://github.com/tweag/rules_nixpkgs/releases/download/v0.10.0/rules_nixpkgs-0.10.0.tar.gz",
+  "patches": {
+    "debug.patch": "sha256-v6i0t42xSAMuNNYWXwbloChIrlsu9/nIva+NSKVsC2c="
+  },
+  "patch_strip": 2
 }