diff --git a/development/scons/scons_manifest.py b/development/scons/scons_manifest.py
index 96fa789f19..b5e31f1572 100644
--- a/development/scons/scons_manifest.py
+++ b/development/scons/scons_manifest.py
@@ -916,7 +916,7 @@ src_client_header_files = Split('''
 
 src_client_files = Split('''
     boost.cpp
-    client.C
+    client.cpp
     debug.cpp
     gettext.cpp
     Messages.cpp
diff --git a/src/client/Makefile.am b/src/client/Makefile.am
index 445717fb67..812518d690 100644
--- a/src/client/Makefile.am
+++ b/src/client/Makefile.am
@@ -20,7 +20,7 @@ lyxclient_LDADD = \
 
 lyxclient_SOURCES = \
 	boost.cpp \
-	client.C \
+	client.cpp \
 	debug.cpp \
 	debug.h \
 	gettext.cpp \
diff --git a/src/client/client.C b/src/client/client.C
index 6f58efd014..7cffd780d7 100644
--- a/src/client/client.C
+++ b/src/client/client.C
@@ -1,5 +1,5 @@
 /**
- * \file client.C
+ * \file client.cpp
  * This file is part of LyX, the document processor.
  * Licence details can be found in the file COPYING.
  *