diff --git a/Makefile-rpm-ostree.am b/Makefile-rpm-ostree.am
index c087c5a5..742b4cf0 100644
--- a/Makefile-rpm-ostree.am
+++ b/Makefile-rpm-ostree.am
@@ -25,7 +25,7 @@ rpm_ostree_SOURCES = src/app/main.cxx \
 	src/app/rpmostree-builtin-rollback.cxx \
 	src/app/rpmostree-builtin-deploy.cxx \
 	src/app/rpmostree-builtin-reload.cxx \
-	src/app/rpmostree-builtin-rebase.c \
+	src/app/rpmostree-builtin-rebase.cxx \
 	src/app/rpmostree-builtin-cancel.c \
 	src/app/rpmostree-builtin-cliwrap.c \
 	src/app/rpmostree-builtin-cleanup.c \
diff --git a/src/app/rpmostree-builtin-rebase.c b/src/app/rpmostree-builtin-rebase.cxx
similarity index 100%
rename from src/app/rpmostree-builtin-rebase.c
rename to src/app/rpmostree-builtin-rebase.cxx