diff --git a/debian/patches/503_shadowconfig.8 b/debian/patches/503_shadowconfig.8.patch
similarity index 100%
rename from debian/patches/503_shadowconfig.8
rename to debian/patches/503_shadowconfig.8.patch
diff --git a/debian/patches/505_useradd_recommend_adduser b/debian/patches/505_useradd_recommend_adduser.patch
similarity index 100%
rename from debian/patches/505_useradd_recommend_adduser
rename to debian/patches/505_useradd_recommend_adduser.patch
diff --git a/debian/patches/900_testsuite_groupmems b/debian/patches/900_testsuite_groupmems.patch
similarity index 100%
rename from debian/patches/900_testsuite_groupmems
rename to debian/patches/900_testsuite_groupmems.patch
diff --git a/debian/patches/901_testsuite_gcov b/debian/patches/901_testsuite_gcov.patch
similarity index 100%
rename from debian/patches/901_testsuite_gcov
rename to debian/patches/901_testsuite_gcov.patch
diff --git a/debian/patches/series b/debian/patches/series
index 5084305c..fbc227b3 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -8,7 +8,7 @@
 463_login_delay_obeys_to_PAM.patch
 501_commonio_group_shadow.patch
 502_debian_useradd_defaults.patch
-503_shadowconfig.8
-505_useradd_recommend_adduser
+503_shadowconfig.8.patch
+505_useradd_recommend_adduser.patch
 506_relaxed_usernames.patch
 542_useradd-O_option.patch