diff --git a/Sources/Functions/FunctionsClient.swift b/Sources/Functions/FunctionsClient.swift
index 214c208c7..fa6dc135d 100644
--- a/Sources/Functions/FunctionsClient.swift
+++ b/Sources/Functions/FunctionsClient.swift
@@ -246,10 +246,11 @@ public final class FunctionsClient: Sendable {
   private func buildRequest(functionName: String, options: FunctionInvokeOptions)
     -> Helpers.HTTPRequest
   {
+    var query = options.query
     var request = HTTPRequest(
       url: url.appendingPathComponent(functionName),
       method: FunctionInvokeOptions.httpMethod(options.method) ?? .post,
-      query: options.query,
+      query: query,
       headers: mutableState.headers.merging(with: options.headers),
       body: options.body,
       timeoutInterval: FunctionsClient.requestIdleTimeout
@@ -257,6 +258,8 @@ public final class FunctionsClient: Sendable {
 
     if let region = options.region ?? region {
       request.headers[.xRegion] = region
+      query.appendOrUpdate(URLQueryItem(name: "forceFunctionRegion", value: region))
+      request.query = query
     }
 
     return request
diff --git a/Tests/FunctionsTests/FunctionsClientTests.swift b/Tests/FunctionsTests/FunctionsClientTests.swift
index 2d19c5d29..652a1a9f8 100644
--- a/Tests/FunctionsTests/FunctionsClientTests.swift
+++ b/Tests/FunctionsTests/FunctionsClientTests.swift
@@ -164,6 +164,7 @@ final class FunctionsClientTests: XCTestCase {
 
     Mock(
       url: url.appendingPathComponent("hello-world"),
+      ignoreQuery: true,
       statusCode: 200,
       data: [.post: Data()]
     )
@@ -174,7 +175,7 @@ final class FunctionsClientTests: XCTestCase {
       	--header "X-Client-Info: functions-swift/0.0.0" \
       	--header "apikey: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZS1kZW1vIiwicm9sZSI6ImFub24iLCJleHAiOjE5ODM4MTI5OTZ9.CRXP1A7WOeoJeXxjNni43kdQwgnWNReilDMblYTn_I0" \
       	--header "x-region: ca-central-1" \
-      	"http://localhost:5432/functions/v1/hello-world"
+      	"http://localhost:5432/functions/v1/hello-world?forceFunctionRegion=ca-central-1"
       """#
     }
     .register()
@@ -185,6 +186,7 @@ final class FunctionsClientTests: XCTestCase {
   func testInvokeWithRegion() async throws {
     Mock(
       url: url.appendingPathComponent("hello-world"),
+      ignoreQuery: true,
       statusCode: 200,
       data: [.post: Data()]
     )
@@ -195,7 +197,7 @@ final class FunctionsClientTests: XCTestCase {
       	--header "X-Client-Info: functions-swift/0.0.0" \
       	--header "apikey: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZS1kZW1vIiwicm9sZSI6ImFub24iLCJleHAiOjE5ODM4MTI5OTZ9.CRXP1A7WOeoJeXxjNni43kdQwgnWNReilDMblYTn_I0" \
       	--header "x-region: ca-central-1" \
-      	"http://localhost:5432/functions/v1/hello-world"
+      	"http://localhost:5432/functions/v1/hello-world?forceFunctionRegion=ca-central-1"
       """#
     }
     .register()
diff --git a/Tests/FunctionsTests/__Snapshots__/RequestTests/testInvokeWithCustomRegion.1.txt b/Tests/FunctionsTests/__Snapshots__/RequestTests/testInvokeWithCustomRegion.1.txt
index b7ebf5c70..72ba071c2 100644
--- a/Tests/FunctionsTests/__Snapshots__/RequestTests/testInvokeWithCustomRegion.1.txt
+++ b/Tests/FunctionsTests/__Snapshots__/RequestTests/testInvokeWithCustomRegion.1.txt
@@ -3,4 +3,4 @@ curl \
 	--header "apikey: supabase.anon.key" \
 	--header "x-client-info: functions-swift/x.y.z" \
 	--header "x-region: ap-northeast-1" \
-	"http://localhost:5432/functions/v1/hello-world"
\ No newline at end of file
+	"http://localhost:5432/functions/v1/hello-world?forceFunctionRegion=ap-northeast-1"
\ No newline at end of file