diff --git a/Makefile-daemon.am b/Makefile-daemon.am
index b8d6e0d2..637f23a6 100644
--- a/Makefile-daemon.am
+++ b/Makefile-daemon.am
@@ -36,7 +36,7 @@ librpmostreed_sources = \
 	src/daemon/rpmostree-sysroot-upgrader.h \
 	src/daemon/rpmostree-sysroot-upgrader.cxx \
 	src/daemon/rpmostreed-errors.h \
-	src/daemon/rpmostreed-errors.c \
+	src/daemon/rpmostreed-errors.cxx \
 	src/daemon/rpmostreed-deployment-utils.h \
 	src/daemon/rpmostreed-deployment-utils.cxx \
 	src/daemon/rpmostreed-transaction.h \
diff --git a/src/daemon/rpmostreed-errors.c b/src/daemon/rpmostreed-errors.cxx
similarity index 100%
rename from src/daemon/rpmostreed-errors.c
rename to src/daemon/rpmostreed-errors.cxx