diff --git a/Sources/RTMP/AMF0Serializer.swift b/Sources/RTMP/AMF0Serializer.swift
index 382687cc4..165ec9ac6 100644
--- a/Sources/RTMP/AMF0Serializer.swift
+++ b/Sources/RTMP/AMF0Serializer.swift
@@ -124,6 +124,8 @@ extension AMF0Serializer: AMFSerializer {
             return serialize(Double(value))
         case let value as Float:
             return serialize(Double(value))
+        case let value as CGFloat:
+            return serialize(Double(value))
         case let value as Double:
             return serialize(Double(value))
         case let value as Date:
diff --git a/Sources/RTMP/AMF3Serializer.swift b/Sources/RTMP/AMF3Serializer.swift
index 165a79c1a..10f6df67f 100644
--- a/Sources/RTMP/AMF3Serializer.swift
+++ b/Sources/RTMP/AMF3Serializer.swift
@@ -114,6 +114,8 @@ extension AMF3Serializer: AMFSerializer {
             return serialize(Double(value))
         case let value as Float:
             return serialize(Double(value))
+        case let value as CGFloat:
+            return serialize(Double(value))
         case let value as Double:
             return serialize(Double(value))
         case let value as Date: