diff --git a/Doc/tools/sphinxext/patchlevel.py b/Doc/tools/sphinxext/patchlevel.py
index cb9e35c2267..082858e41c2 100644
--- a/Doc/tools/sphinxext/patchlevel.py
+++ b/Doc/tools/sphinxext/patchlevel.py
@@ -41,7 +41,7 @@ def get_header_version_info(srcdir):
     suffixes = {
         'PY_RELEASE_LEVEL_ALPHA': 'a',
         'PY_RELEASE_LEVEL_BETA':  'b',
-        'PY_RELEASE_LEVEL_GAMMA': 'c',
+        'PY_RELEASE_LEVEL_GAMMA': 'rc',
         }
     if level != 'PY_RELEASE_LEVEL_FINAL':
         release += suffixes[level] + str(int(d['PY_RELEASE_SERIAL']))
diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index a38cdd11759..c1e9e1e7ff9 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -29,8 +29,10 @@ def _sphinx_version():
     major, minor, micro, level, serial = sys.version_info
     release = '%s%s' % (major, minor)
     if micro:
-        release += '%s' % micro
-    if level != 'final':
+        release += '%s' % (micro,)
+    if level == 'candidate':
+        release += 'rc%s' % (serial,)
+    elif level != 'final':
         release += '%s%s' % (level[0], serial)
     return release
 
diff --git a/Tools/msi/msi.py b/Tools/msi/msi.py
index 986852a1ee0..95c07bc8246 100644
--- a/Tools/msi/msi.py
+++ b/Tools/msi/msi.py
@@ -120,7 +120,10 @@ docfile = ""
 if micro:
     docfile = str(micro)
 if level < 0xf:
-    docfile = '%x%s' % (level, serial)
+    if level == 0xC:
+        docfile = "rc%s" % (serial,)
+    else:
+        docfile = '%x%s' % (level, serial)
 docfile = 'python%s%s%s.chm' % (major, minor, docfile)
 
 # Build the mingw import library, libpythonXY.a