diff --git a/src/shared/efivars.h b/src/shared/efivars.h
index 9a4880de7d..5b5951321c 100644
--- a/src/shared/efivars.h
+++ b/src/shared/efivars.h
@@ -20,6 +20,9 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#if ! ENABLE_EFI
+#include <errno.h>
+#endif
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>