diff --git a/Source/ThirdParty/libwebrtc/ChangeLog b/Source/ThirdParty/libwebrtc/ChangeLog
index 4348f71..1109250 100644
--- a/Source/ThirdParty/libwebrtc/ChangeLog
+++ b/Source/ThirdParty/libwebrtc/ChangeLog
@@ -1,3 +1,15 @@
+2020-04-02  Simon Fraser  <simon.fraser@apple.com>
+
+        Build fix after r259385.
+
+        Reviewed by David Kilzer, Youenn Fablet.
+
+        Convert isStandardFrameSize() into a lambda function since it only has one call site.
+
+        * Source/webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm:
+        (-[RTCVideoEncoderH264 resetCompressionSessionWithPixelFormat:]):
+        (isStandardFrameSize): Deleted.
+
 2020-04-02  Youenn Fablet  <youenn@apple.com>
 
         Temporarily restrict kVTVideoEncoderSpecification_RequiredLowLatency use to iOS
diff --git a/Source/ThirdParty/libwebrtc/Source/webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm b/Source/ThirdParty/libwebrtc/Source/webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm
index 5ffe624..94cbc41 100644
--- a/Source/ThirdParty/libwebrtc/Source/webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm
+++ b/Source/ThirdParty/libwebrtc/Source/webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm
@@ -48,34 +48,6 @@
 VT_EXPORT const CFStringRef kVTVideoEncoderSpecification_Usage;
 VT_EXPORT const CFStringRef kVTCompressionPropertyKey_Usage;
 
-#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS) && !HAVE_VTB_REQUIREDLOWLATENCY
-static inline bool isStandardFrameSize(int32_t width, int32_t height)
-{
-    // FIXME: Envision relaxing this rule, something like width and height dividable by 4 or 8 should be good enough.
-    if (width == 1280)
-        return height == 720;
-    if (width == 720)
-        return height == 1280;
-    if (width == 960)
-        return height == 540;
-    if (width == 540)
-        return height == 960;
-    if (width == 640)
-        return height == 480;
-    if (width == 480)
-        return height == 640;
-    if (width == 288)
-        return height == 352;
-    if (width == 352)
-        return height == 288;
-    if (width == 320)
-        return height == 240;
-    if (width == 240)
-        return height == 320;
-    return false;
-}
-#endif
-
 @interface RTCVideoEncoderH264 ()
 
 - (void)frameWasEncoded:(OSStatus)status
@@ -786,6 +758,31 @@
       sourceAttributes = nullptr;
     }
 
+    auto isStandardFrameSize = [](int32_t width, int32_t height) {
+        // FIXME: Envision relaxing this rule, something like width and height dividable by 4 or 8 should be good enough.
+        if (width == 1280)
+            return height == 720;
+        if (width == 720)
+            return height == 1280;
+        if (width == 960)
+            return height == 540;
+        if (width == 540)
+            return height == 960;
+        if (width == 640)
+            return height == 480;
+        if (width == 480)
+            return height == 640;
+        if (width == 288)
+            return height == 352;
+        if (width == 352)
+            return height == 288;
+        if (width == 320)
+            return height == 240;
+        if (width == 240)
+            return height == 320;
+        return false;
+    };
+
     if (!isStandardFrameSize(_width, _height)) {
       _disableEncoding = true;
       RTC_LOG(LS_ERROR) << "Using H264 software encoder with non standard size is not supported";