diff --git a/src/projects/kostore/CMakeLists.txt b/src/projects/kostore/CMakeLists.txt
index 9ac7377..bc35875 100644
--- a/src/projects/kostore/CMakeLists.txt
+++ b/src/projects/kostore/CMakeLists.txt
@@ -16,5 +16,5 @@ link_directories(
 ##### kostore (static) ##########################
 
 tde_add_library( kostore STATIC_PIC AUTOMOC
-  SOURCES koStore.cc koZipStore.cc koStoreBase.cc
+  SOURCES koStore.cpp koZipStore.cpp koStoreBase.cpp
 )
diff --git a/src/projects/kostore/Makefile.am b/src/projects/kostore/Makefile.am
index 65de5e7..e87beeb 100644
--- a/src/projects/kostore/Makefile.am
+++ b/src/projects/kostore/Makefile.am
@@ -6,6 +6,6 @@ INCLUDES = $(all_includes)
 ####### Files
 
 libkostore_la_LIBADD = $(LIB_TDEIO)
-libkostore_la_SOURCES = koStore.cc koZipStore.cc koStoreBase.cc
+libkostore_la_SOURCES = koStore.cpp koZipStore.cpp koStoreBase.cpp
 #libkostore_la_LDFLAGS = $(all_libraries) -version-info 3:0:0 $(KDE_LDFLAGS) -no-undefined
 #include_HEADERS = koStore.h
diff --git a/src/projects/kostore/koStore.cc b/src/projects/kostore/koStore.cpp
similarity index 100%
rename from src/projects/kostore/koStore.cc
rename to src/projects/kostore/koStore.cpp
diff --git a/src/projects/kostore/koStoreBase.cc b/src/projects/kostore/koStoreBase.cpp
similarity index 100%
rename from src/projects/kostore/koStoreBase.cc
rename to src/projects/kostore/koStoreBase.cpp
diff --git a/src/projects/kostore/koZipStore.cc b/src/projects/kostore/koZipStore.cpp
similarity index 100%
rename from src/projects/kostore/koZipStore.cc
rename to src/projects/kostore/koZipStore.cpp