diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
index cc71c37..ee3da9b 100644
--- a/Source/WebKit/ChangeLog
+++ b/Source/WebKit/ChangeLog
@@ -1,3 +1,20 @@
+2020-01-14  Brent Fulgham  <bfulgham@apple.com>
+
+        Expand WebContent process sandbox with additional syscall
+        https://bugs.webkit.org/show_bug.cgi?id=206260
+        <rdar://problem/58580997>
+
+        Reviewed by Per Arne Vollan.
+
+        Testing shows that we will improve performance on some platforms by supporting an additional Syscall.
+
+        This patch revises our sandboxes so that WebKit can use this fast path if available.
+
+        No new tests. No change in test result behavior.
+
+        * Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb:
+        * WebProcess/com.apple.WebProcess.sb.in:
+
 2020-01-14  Commit Queue  <commit-queue@webkit.org>
 
         Unreviewed, rolling out r254533 and r254535.
diff --git a/Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb b/Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb
index f09b741..d1b5da5 100644
--- a/Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb
+++ b/Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb
@@ -1126,5 +1126,6 @@
         (syscall-number SYS_kqueue_workloop_ctl) ;; <rdar://problem/50999499>
         (syscall-number SYS_psynch_rw_rdlock) ;; <rdar://problem/51134351>
         (syscall-number SYS_faccessat) ;; <rdar://problem/56998930>
+        (syscall-number SYS_objc_bp_assist_cfg_np) ;; <rdar://problem/55924791>
     )
 )
diff --git a/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in b/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in
index edff9ba..ce71c39 100644
--- a/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in
+++ b/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in
@@ -1021,5 +1021,6 @@
         (syscall-number SYS_kqueue_workloop_ctl) ;; <rdar://problem/50999499>
         (syscall-number SYS_faccessat) ;; <rdar://problem/56690456>
         (syscall-number SYS_fsetxattr) ;; <rdar://problem/56332491>
+        (syscall-number SYS_objc_bp_assist_cfg_np) ;; <rdar://problem/55924791>
     )
 )