diff --git a/Makefile-rpm-ostree.am b/Makefile-rpm-ostree.am
index 9d450e8b..b07008f4 100644
--- a/Makefile-rpm-ostree.am
+++ b/Makefile-rpm-ostree.am
@@ -35,7 +35,7 @@ rpm_ostree_SOURCES = src/app/main.cxx \
 	src/app/rpmostree-builtin-usroverlay.c \
 	src/app/rpmostree-builtin-override.c \
 	src/app/rpmostree-builtin-refresh-md.c \
-	src/app/rpmostree-builtin-reset.c \
+	src/app/rpmostree-builtin-reset.cxx \
 	src/app/rpmostree-pkg-builtins.cxx \
 	src/app/rpmostree-builtin-status.c \
 	src/app/rpmostree-builtin-ex.c \
diff --git a/src/app/rpmostree-builtin-reset.c b/src/app/rpmostree-builtin-reset.cxx
similarity index 100%
rename from src/app/rpmostree-builtin-reset.c
rename to src/app/rpmostree-builtin-reset.cxx