diff --git a/target/linux/generic-2.6/patches-2.6.21/990-buildfix.patch b/target/linux/generic-2.6/patches-2.6.21/990-buildfix.patch
new file mode 100644
index 000000000..9b3152de0
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.21/990-buildfix.patch
@@ -0,0 +1,7 @@
+--- a/scripts/mod/sumversion.c
++++ b/scripts/mod/sumversion.c
+@@ -1,3 +1,4 @@
++#include <linux/limits.h>
+ #include <netinet/in.h>
+ #ifdef __sun__
+ #include <inttypes.h>