diff --git a/arch/nt32/bits/ioctl.h b/arch/nt32/bits/ioctl.h
index 1bae89b..d17127a 100644
--- a/arch/nt32/bits/ioctl.h
+++ b/arch/nt32/bits/ioctl.h
@@ -133,6 +133,7 @@
 #define SIOCGPGRP       0x8904
 #define SIOCATMARK      0x8905
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C
diff --git a/arch/nt64/bits/ioctl.h b/arch/nt64/bits/ioctl.h
index 1bae89b..d17127a 100644
--- a/arch/nt64/bits/ioctl.h
+++ b/arch/nt64/bits/ioctl.h
@@ -133,6 +133,7 @@
 #define SIOCGPGRP       0x8904
 #define SIOCATMARK      0x8905
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C