diff --git a/lib/com_err/compile_et.h b/lib/com_err/compile_et.h
index cd24727b0..3281d5fcc 100644
--- a/lib/com_err/compile_et.h
+++ b/lib/com_err/compile_et.h
@@ -40,6 +40,7 @@
 #include <config.h>
 #endif
 
+#include <err.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>