diff --git a/package/network/config/swconfig/Makefile b/package/network/config/swconfig/Makefile
index e457ce4882..8b1d6cd64a 100644
--- a/package/network/config/swconfig/Makefile
+++ b/package/network/config/swconfig/Makefile
@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=swconfig
-PKG_RELEASE:=11
+PKG_RELEASE:=12
 
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 PKG_LICENSE:=GPL-2.0
diff --git a/package/network/config/swconfig/src/swlib.c b/package/network/config/swconfig/src/swlib.c
index 0fb8ebb392..0e09a1505b 100644
--- a/package/network/config/swconfig/src/swlib.c
+++ b/package/network/config/swconfig/src/swlib.c
@@ -16,6 +16,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <ctype.h>
 #include <inttypes.h>
 #include <errno.h>
 #include <stdint.h>