diff --git a/checkdeps.py b/checkdeps.py
index 28b1e559..c0e10051 100755
--- a/checkdeps.py
+++ b/checkdeps.py
@@ -137,6 +137,8 @@ if prereqs:
 OPSYS = detectOS()
 CMD = PACKAGE_MANAGER[OPSYS] if OPSYS in PACKAGE_MANAGER else 'UNKNOWN_INSTALLER'
 for lhs, rhs in EXTRAS_REQUIRE.items():
+    if OPSYS is None:
+        break
     if rhs and any([
         EXTRAS_REQUIRE_DEPS[x][OPSYS]
         for x in rhs
diff --git a/src/depends.py b/src/depends.py
index 39f5e759..d284a11b 100755
--- a/src/depends.py
+++ b/src/depends.py
@@ -29,6 +29,7 @@ logger.addHandler(handler)
 logger.setLevel(logging.ERROR)
 
 OS_RELEASE = {
+    "Debian GNU/Linux".lower(): "Debian",
     "fedora": "Fedora",
     "opensuse": "openSUSE",
     "ubuntu": "Ubuntu",