diff --git a/separate_intermediates/profile.py b/separate_intermediates/profile.py
index e028609..10eb074 100644
--- a/separate_intermediates/profile.py
+++ b/separate_intermediates/profile.py
@@ -36,7 +36,7 @@ def _concat_ca_certificates_of(peer):
           p.intermediate_ca_certificate_path(peer),
           p.root_ca_certificate_path()],
          stdout=chain_file)
-    chain_file.close
+    chain_file.close()
 
 
 def generate(opts):
diff --git a/tls_gen/gen.py b/tls_gen/gen.py
index 4a22c90..7c62af4 100644
--- a/tls_gen/gen.py
+++ b/tls_gen/gen.py
@@ -117,12 +117,12 @@ def prepare_ca_directory(dir_name):
 
     serial = open(p.relative_path(dir_name, "serial"), "w")
     serial.write("01")
-    serial.close
+    serial.close()
 
     index_txt = open(p.relative_path(dir_name, "index.txt"), "w")
-    index_txt.close
+    index_txt.close()
     index_txt = open(p.relative_path(dir_name, "index.txt.attr"), "w")
-    index_txt.close
+    index_txt.close()
 
 #
 # Root CA
diff --git a/two_shared_intermediates/profile.py b/two_shared_intermediates/profile.py
index 8403ccb..4398d91 100644
--- a/two_shared_intermediates/profile.py
+++ b/two_shared_intermediates/profile.py
@@ -30,7 +30,7 @@ def _concat_certificates():
           p.intermediate_ca_certificate_path("1"),
           p.root_ca_certificate_path()],
          stdout=chain_file)
-    chain_file.close
+    chain_file.close()
 
 
 def generate(opts):