diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
index 2a1f13c..85798c4 100644
--- a/Source/WebKit/ChangeLog
+++ b/Source/WebKit/ChangeLog
@@ -1,3 +1,15 @@
+2020-04-02  Per Arne Vollan  <pvollan@apple.com>
+
+        [iOS] Allow use of syscall from the WebContent sandbox
+        https://bugs.webkit.org/show_bug.cgi?id=209920
+        <rdar://problem/58743778>
+
+        Reviewed by Darin Adler.
+
+        Add syscall to the WebContent sandbox on iOS.
+
+        * Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb:
+
 2020-04-02  Brent Fulgham  <bfulgham@apple.com>
 
         [iOS] Remove use of 'apple-signed-executable?' from Sandbox
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 5893378..d74e77a 100644
--- a/Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb
+++ b/Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.WebContent.sb
@@ -1053,6 +1053,7 @@
         (syscall-number SYS_faccessat) ;; <rdar://problem/56998930>
         (syscall-number SYS_objc_bp_assist_cfg_np) ;; <rdar://problem/55924791>
         (syscall-number SYS_shared_region_map_and_slide_2_np) ;; <rdar://problem/60294880>
+        (syscall-number SYS_ulock_wait2) ;; <rdar://problem/58743778>
     )
 )