diff --git a/Source/CoreGraphicsPolyfill.swift b/Source/CoreGraphicsPolyfill.swift
index ca38dc6..5ac489f 100644
--- a/Source/CoreGraphicsPolyfill.swift
+++ b/Source/CoreGraphicsPolyfill.swift
@@ -5,7 +5,7 @@
 //  Created by khoi on 10/5/25.
 //
 
-#if os(Linux)
+#if os(Linux) || os(WASI)
 import Foundation
 #elseif canImport(FoundationEssentials)
 import FoundationEssentials
@@ -19,7 +19,7 @@ import WASILibc
 import Glibc
 #endif
 
-#if os(Linux)
+#if os(Linux) || os(WASI)
 public typealias CGFloat = Foundation.CGFloat
 public typealias CGPoint = Foundation.CGPoint
 public typealias CGSize = Foundation.CGSize
diff --git a/Source/Serialization/Serializations.swift b/Source/Serialization/Serializations.swift
index 461644e..ddc3570 100644
--- a/Source/Serialization/Serializations.swift
+++ b/Source/Serialization/Serializations.swift
@@ -49,7 +49,7 @@ extension CGFloat: SerializableAtom {
 
 }
 
-#if canImport(CoreGraphics) || os(Linux)
+#if canImport(CoreGraphics) || os(Linux) || os(WASI)
 extension Double: SerializableAtom {
 
     func serialize() -> String {
diff --git a/Tests/CoreGraphicsPolyfillTests/PolyfillTests.swift b/Tests/CoreGraphicsPolyfillTests/PolyfillTests.swift
index 859d517..79f9d54 100644
--- a/Tests/CoreGraphicsPolyfillTests/PolyfillTests.swift
+++ b/Tests/CoreGraphicsPolyfillTests/PolyfillTests.swift
@@ -16,6 +16,7 @@
 //  since the polyfill types are aliases to the native CoreGraphics types.
 //
 
+import Foundation
 import XCTest
 
 @testable import SVGView
@@ -23,6 +24,17 @@ import XCTest
 final class PolyfillTests: XCTestCase {
     
     #if os(WASI) || os(Linux) || os(Android)
+
+    #if os(WASI) || os(Linux)
+    func testGeometryTypesMatchFoundation() {
+        let scalar: Foundation.CGFloat = CGFloat(1)
+        let point: Foundation.CGPoint = CGPoint(x: scalar, y: scalar)
+        let size: Foundation.CGSize = CGSize(width: scalar, height: scalar)
+        let rect: Foundation.CGRect = CGRect(origin: point, size: size)
+
+        XCTAssertEqual(rect, Foundation.CGRect(x: 1, y: 1, width: 1, height: 1))
+    }
+    #endif
     
     // MARK: - CGAffineTransform Tests