diff --git a/Alc/filters/filter.c b/Alc/filters/filter.cpp
similarity index 100%
rename from Alc/filters/filter.c
rename to Alc/filters/filter.cpp
diff --git a/Alc/filters/nfc.c b/Alc/filters/nfc.cpp
similarity index 100%
rename from Alc/filters/nfc.c
rename to Alc/filters/nfc.cpp
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19dc0439..cca21465 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -821,8 +821,8 @@ SET(ALC_OBJS
     Alc/effects/pshifter.cpp
     Alc/effects/reverb.cpp
     Alc/filters/defs.h
-    Alc/filters/filter.c
-    Alc/filters/nfc.c
+    Alc/filters/filter.cpp
+    Alc/filters/nfc.cpp
     Alc/filters/nfc.h
     Alc/filters/splitter.cpp
     Alc/filters/splitter.h