diff --git a/mopidy/backends/local/__init__.py b/mopidy/backends/local/__init__.py
index 8f7f7be0..99c50e1f 100644
--- a/mopidy/backends/local/__init__.py
+++ b/mopidy/backends/local/__init__.py
@@ -37,7 +37,7 @@ class Extension(ext.Extension):
     version = mopidy.__version__
 
     def get_default_config(self):
-        return '[local]'
+        return '[ext.local]'
 
     def validate_config(self, config):
         pass
diff --git a/mopidy/backends/spotify/__init__.py b/mopidy/backends/spotify/__init__.py
index 8c65817a..efa5338b 100644
--- a/mopidy/backends/spotify/__init__.py
+++ b/mopidy/backends/spotify/__init__.py
@@ -7,7 +7,7 @@ from mopidy.utils.formatting import indent
 
 
 config = """
-[spotify]
+[ext.spotify]
 
 # If the Spotify extension should be enabled or not
 enabled = true
diff --git a/mopidy/backends/stream/__init__.py b/mopidy/backends/stream/__init__.py
index 8c856c10..dbf3e6d5 100644
--- a/mopidy/backends/stream/__init__.py
+++ b/mopidy/backends/stream/__init__.py
@@ -34,7 +34,7 @@ class Extension(ext.Extension):
     version = mopidy.__version__
 
     def get_default_config(self):
-        return '[stream]'
+        return '[ext.stream]'
 
     def validate_config(self, config):
         pass
diff --git a/mopidy/frontends/http/__init__.py b/mopidy/frontends/http/__init__.py
index fb354c09..25fe788f 100644
--- a/mopidy/frontends/http/__init__.py
+++ b/mopidy/frontends/http/__init__.py
@@ -495,7 +495,7 @@ class Extension(ext.Extension):
     version = mopidy.__version__
 
     def get_default_config(self):
-        return '[http]'
+        return '[ext.http]'
 
     def validate_config(self, config):
         pass
diff --git a/mopidy/frontends/lastfm/__init__.py b/mopidy/frontends/lastfm/__init__.py
index aac27848..e3f1f5c6 100644
--- a/mopidy/frontends/lastfm/__init__.py
+++ b/mopidy/frontends/lastfm/__init__.py
@@ -40,7 +40,7 @@ class Extension(ext.Extension):
     version = mopidy.__version__
 
     def get_default_config(self):
-        return '[lastfm]'
+        return '[ext.lastfm]'
 
     def validate_config(self, config):
         pass
diff --git a/mopidy/frontends/mpd/__init__.py b/mopidy/frontends/mpd/__init__.py
index e095da14..8d9d13e0 100644
--- a/mopidy/frontends/mpd/__init__.py
+++ b/mopidy/frontends/mpd/__init__.py
@@ -61,7 +61,7 @@ class Extension(ext.Extension):
     version = mopidy.__version__
 
     def get_default_config(self):
-        return '[mpd]'
+        return '[ext.mpd]'
 
     def validate_config(self, config):
         pass
diff --git a/mopidy/frontends/mpris/__init__.py b/mopidy/frontends/mpris/__init__.py
index acaff7ff..b21dafff 100644
--- a/mopidy/frontends/mpris/__init__.py
+++ b/mopidy/frontends/mpris/__init__.py
@@ -68,7 +68,7 @@ class Extension(ext.Extension):
     version = mopidy.__version__
 
     def get_default_config(self):
-        return '[mpris]'
+        return '[ext.mpris]'
 
     def validate_config(self, config):
         pass