diff --git a/src/isinetaddr4.c b/src/isinetaddr4.c
index 2404d9b..e5d604e 100644
--- a/src/isinetaddr4.c
+++ b/src/isinetaddr4.c
@@ -2,7 +2,6 @@
 #include <string.h>
 #include <stdlib.h>
 #include <isinetaddr.h>
-#include <errno.h>
 
 static const int  MAX_BUFLEN   = 3;
 static const int  MAX_OCTETS   = 4;