diff --git a/src/input/plugins/QobuzClient.cxx b/src/input/plugins/QobuzClient.cxx
index 69d3022be..0943dc83b 100644
--- a/src/input/plugins/QobuzClient.cxx
+++ b/src/input/plugins/QobuzClient.cxx
@@ -19,7 +19,6 @@
 
 #include "QobuzClient.hxx"
 #include "lib/crypto/MD5.hxx"
-#include "util/ConstBuffer.hxx"
 
 #include <cassert>
 #include <stdexcept>
diff --git a/src/input/plugins/QobuzErrorParser.cxx b/src/input/plugins/QobuzErrorParser.cxx
index 0864f99ce..8ab325b87 100644
--- a/src/input/plugins/QobuzErrorParser.cxx
+++ b/src/input/plugins/QobuzErrorParser.cxx
@@ -19,7 +19,6 @@
 
 #include "QobuzErrorParser.hxx"
 #include "lib/yajl/Callbacks.hxx"
-#include "util/ConstBuffer.hxx"
 #include "util/RuntimeError.hxx"
 
 
diff --git a/src/input/plugins/QobuzErrorParser.hxx b/src/input/plugins/QobuzErrorParser.hxx
index 34e438fcc..47857e353 100644
--- a/src/input/plugins/QobuzErrorParser.hxx
+++ b/src/input/plugins/QobuzErrorParser.hxx
@@ -25,8 +25,6 @@
 
 #include <string_view>
 
-template<typename T> struct ConstBuffer;
-
 /**
  * Parse an error JSON response.
  */
diff --git a/test/run_input.cxx b/test/run_input.cxx
index 7877650f3..5fc1e044e 100644
--- a/test/run_input.cxx
+++ b/test/run_input.cxx
@@ -35,7 +35,6 @@
 #include "fs/NarrowPath.hxx"
 #include "io/BufferedOutputStream.hxx"
 #include "io/StdioOutputStream.hxx"
-#include "util/ConstBuffer.hxx"
 #include "util/OptionDef.hxx"
 #include "util/OptionParser.hxx"
 #include "util/PrintException.hxx"