diff --git a/unix/linux/mkall.go b/unix/linux/mkall.go
index 184dad73..64576479 100644
--- a/unix/linux/mkall.go
+++ b/unix/linux/mkall.go
@@ -423,7 +423,7 @@ func generatePtracePair(arch1, arch2 string) error {
 		return err
 	}
 	buf := bufio.NewWriter(f)
-	fmt.Fprintf(buf, "// Code generated by linux/mkall.go generatePtracePair(%s, %s).  DO NOT EDIT.\n", arch1, arch2)
+	fmt.Fprintf(buf, "// Code generated by linux/mkall.go generatePtracePair(%s, %s). DO NOT EDIT.\n", arch1, arch2)
 	fmt.Fprintf(buf, "\n")
 	fmt.Fprintf(buf, "// +build linux\n")
 	fmt.Fprintf(buf, "// +build %s %s\n", arch1, arch2)
diff --git a/unix/zptrace386_linux.go b/unix/zptrace386_linux.go
index a5503592..2d21c49e 100644
--- a/unix/zptrace386_linux.go
+++ b/unix/zptrace386_linux.go
@@ -1,4 +1,4 @@
-// Code generated by linux/mkall.go generatePtracePair(386, amd64).  DO NOT EDIT.
+// Code generated by linux/mkall.go generatePtracePair(386, amd64). DO NOT EDIT.
 
 // +build linux
 // +build 386 amd64
diff --git a/unix/zptracearm_linux.go b/unix/zptracearm_linux.go
index 630dc0c0..faf23bbe 100644
--- a/unix/zptracearm_linux.go
+++ b/unix/zptracearm_linux.go
@@ -1,4 +1,4 @@
-// Code generated by linux/mkall.go generatePtracePair(arm, arm64).  DO NOT EDIT.
+// Code generated by linux/mkall.go generatePtracePair(arm, arm64). DO NOT EDIT.
 
 // +build linux
 // +build arm arm64
diff --git a/unix/zptracemips_linux.go b/unix/zptracemips_linux.go
index 23f662ac..c431131e 100644
--- a/unix/zptracemips_linux.go
+++ b/unix/zptracemips_linux.go
@@ -1,4 +1,4 @@
-// Code generated by linux/mkall.go generatePtracePair(mips, mips64).  DO NOT EDIT.
+// Code generated by linux/mkall.go generatePtracePair(mips, mips64). DO NOT EDIT.
 
 // +build linux
 // +build mips mips64
diff --git a/unix/zptracemipsle_linux.go b/unix/zptracemipsle_linux.go
index 057caecf..dc3d6d37 100644
--- a/unix/zptracemipsle_linux.go
+++ b/unix/zptracemipsle_linux.go
@@ -1,4 +1,4 @@
-// Code generated by linux/mkall.go generatePtracePair(mipsle, mips64le).  DO NOT EDIT.
+// Code generated by linux/mkall.go generatePtracePair(mipsle, mips64le). DO NOT EDIT.
 
 // +build linux
 // +build mipsle mips64le