diff --git a/Libraries/LibCore/CMakeLists.txt b/Libraries/LibCore/CMakeLists.txt
index 6d288e8562..cbf87c7d66 100644
--- a/Libraries/LibCore/CMakeLists.txt
+++ b/Libraries/LibCore/CMakeLists.txt
@@ -18,7 +18,7 @@ set(SOURCES
     Notifier.cpp
     Object.cpp
     ProcessStatisticsReader.cpp
-    puff.c
+    puff.cpp
     SocketAddress.cpp
     Socket.cpp
     StandardPaths.cpp
diff --git a/Libraries/LibCore/puff.c b/Libraries/LibCore/puff.cpp
similarity index 100%
rename from Libraries/LibCore/puff.c
rename to Libraries/LibCore/puff.cpp