diff --git a/Sources/SwiftGtkGenCore/CodeGen+Signal.swift b/Sources/SwiftGtkGenCore/CodeGen+Signal.swift
index 5f4a0a8..b5f6541 100644
--- a/Sources/SwiftGtkGenCore/CodeGen+Signal.swift
+++ b/Sources/SwiftGtkGenCore/CodeGen+Signal.swift
@@ -27,7 +27,7 @@ extension CodeGenerator {
         let detailClause = signal.isDetailed ? ", \"\(signal.name)\"" : ""
 
         if signal.parameters.isEmpty {
-            let callbackReturn = inhibit ? " -> gboolean" : ""
+            let callbackReturn = inhibit ? " -> gboolean" : " -> Void"
             let handlerCall = inhibit ? "let result = stored(); return result ? 1 : 0" : "stored()"
             return """
                 public func connect\(signalName)(_ handler: @escaping () -> \(handlerReturnType)) -> Int {
@@ -48,7 +48,7 @@ extension CodeGenerator {
             let extractionExprs = signal.parameters.enumerated().map { i, p in
                 cSignalParameterExtraction(index: i, type: p.type)
             }.joined(separator: ", ")
-            let callbackReturn = inhibit ? " -> gboolean" : ""
+            let callbackReturn = inhibit ? " -> gboolean" : " -> Void"
             let handlerCall = inhibit
                 ? "let result = stored(\(extractionExprs)); return result ? 1 : 0"
                 : "stored(\(extractionExprs))"
diff --git a/Tests/SwiftGtkGenCoreTests/SignalConnectionTests.swift b/Tests/SwiftGtkGenCoreTests/SignalConnectionTests.swift
index 6bb0929..0dcc0b5 100644
--- a/Tests/SwiftGtkGenCoreTests/SignalConnectionTests.swift
+++ b/Tests/SwiftGtkGenCoreTests/SignalConnectionTests.swift
@@ -20,3 +20,22 @@ func testSignalWithParams() {
     #expect(connection.contains("_: Int32"))
     #expect(connection.contains("g_signal_connect_data"))
 }
+
+@Test("Non-inhibit signal generates correct @convention(c) with -> Void")
+func testNonInhibitSignalConnection() {
+    let signal = Signal(name: "clicked", parameters: [], returnType: .void)
+    let code = CodeGenerator.generateSignalConnection(signal: signal, inhibit: false)
+    #expect(code.contains("-> Void"))
+    #expect(code.contains("@convention(c) (UnsafeMutableRawPointer?, UnsafeMutableRawPointer?) -> Void"))
+}
+
+@Test("Parameterized non-inhibit signal generates correct @convention(c)")
+func testParameterizedNonInhibitSignalConnection() {
+    let signal = Signal(name: "size-allocate", parameters: [
+        Parameter(name: "width", type: .int32),
+        Parameter(name: "height", type: .int32),
+    ], returnType: .void)
+    let code = CodeGenerator.generateSignalConnection(signal: signal, inhibit: false)
+    #expect(code.contains("-> Void"))
+    #expect(code.contains("@convention(c) (UnsafeMutableRawPointer?, UnsafeMutableRawPointer?, UnsafeMutableRawPointer?) -> Void"))
+}