diff --git a/src/runtime/defs_linux_386.go b/src/runtime/defs_linux_386.go
index ba5ef18e02b..f4db8cf9275 100644
--- a/src/runtime/defs_linux_386.go
+++ b/src/runtime/defs_linux_386.go
@@ -95,7 +95,6 @@ const (
 	_EPOLL_CTL_MOD = 0x3
 
 	_AF_UNIX    = 0x1
-	_F_SETFL    = 0x4
 	_SOCK_DGRAM = 0x2
 )
 
diff --git a/src/runtime/defs_linux_amd64.go b/src/runtime/defs_linux_amd64.go
index 8144354d5af..8480d852199 100644
--- a/src/runtime/defs_linux_amd64.go
+++ b/src/runtime/defs_linux_amd64.go
@@ -91,7 +91,6 @@ const (
 	_EPOLL_CTL_MOD = 0x3
 
 	_AF_UNIX    = 0x1
-	_F_SETFL    = 0x4
 	_SOCK_DGRAM = 0x2
 )
 
diff --git a/src/runtime/defs_linux_arm.go b/src/runtime/defs_linux_arm.go
index d24e0a9d6e6..ea29fd9d98c 100644
--- a/src/runtime/defs_linux_arm.go
+++ b/src/runtime/defs_linux_arm.go
@@ -87,7 +87,6 @@ const (
 	_EPOLL_CTL_MOD = 0x3
 
 	_AF_UNIX    = 0x1
-	_F_SETFL    = 0x4
 	_SOCK_DGRAM = 0x2
 )
 
diff --git a/src/runtime/defs_linux_arm64.go b/src/runtime/defs_linux_arm64.go
index 182887d8d5e..0690cd35b2e 100644
--- a/src/runtime/defs_linux_arm64.go
+++ b/src/runtime/defs_linux_arm64.go
@@ -91,7 +91,6 @@ const (
 	_EPOLL_CTL_MOD = 0x3
 
 	_AF_UNIX    = 0x1
-	_F_SETFL    = 0x4
 	_SOCK_DGRAM = 0x2
 )