diff --git a/.gitignore b/.gitignore
index c59dc2d..a61fd21 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ __pycache__
 *.pyo
 .mypy_cache/
 *.c
+*.cpp
 *.o
 *.so
 build/
diff --git a/bemani/format/afp/blendaltimpl.cpp b/bemani/format/afp/blendaltimpl.cxx
similarity index 100%
rename from bemani/format/afp/blendaltimpl.cpp
rename to bemani/format/afp/blendaltimpl.cxx
diff --git a/bemani/protocol/lz77.cpp b/bemani/protocol/lz77.cxx
similarity index 100%
rename from bemani/protocol/lz77.cpp
rename to bemani/protocol/lz77.cxx
diff --git a/setup.py b/setup.py
index a0c1158..4489cfd 100644
--- a/setup.py
+++ b/setup.py
@@ -90,8 +90,11 @@ setup(
             Extension(
                 "bemani.protocol.lz77alt",
                 [
-                    "bemani/protocol/lz77.cpp",
-                ]
+                    "bemani/protocol/lz77.cxx",
+                ],
+                language="c++",
+                extra_compile_args=["-std=c++14"],
+                extra_link_args=["-std=c++14"],
             ),
             Extension(
                 "bemani.protocol.node",
@@ -127,8 +130,11 @@ setup(
                 "bemani.format.afp.blendalt",
                 [
                     "bemani/format/afp/blendalt.pyx",
-                    "bemani/format/afp/blendaltimpl.cpp",
-                ]
+                    "bemani/format/afp/blendaltimpl.cxx",
+                ],
+                language="c++",
+                extra_compile_args=["-std=c++14"],
+                extra_link_args=["-std=c++14"],
             ),
             Extension(
                 "bemani.format.afp.types.generic",