diff --git a/modules/jooby-apt/src/main/resources/io/jooby/internal/apt/Source.java b/modules/jooby-apt/src/main/resources/io/jooby/internal/apt/Source.java
index 8beea1cc6c..3a5f01e5a6 100644
--- a/modules/jooby-apt/src/main/resources/io/jooby/internal/apt/Source.java
+++ b/modules/jooby-apt/src/main/resources/io/jooby/internal/apt/Source.java
@@ -9,7 +9,7 @@ public class ${generatedClassName} implements io.jooby.MvcExtension {
     }
 
     public ${generatedClassName}(java.util.function.Supplier<${className}> provider) {
-        this(ctx -> provider.get());
+        this(ctx -> (${className}) provider.get());
     }
 
     public ${generatedClassName}(java.util.function.Function<io.jooby.Context, ${className}> factory) {
diff --git a/tests/src/test/java/io/jooby/i3756/C3756.java b/tests/src/test/java/io/jooby/i3756/C3756.java
new file mode 100644
index 0000000000..47125737e9
--- /dev/null
+++ b/tests/src/test/java/io/jooby/i3756/C3756.java
@@ -0,0 +1,25 @@
+/*
+ * Jooby https://jooby.io
+ * Apache License Version 2.0 https://jooby.io/LICENSE.txt
+ * Copyright 2014 Edgar Espina
+ */
+package io.jooby.i3756;
+
+import io.jooby.annotation.GET;
+import io.jooby.annotation.Path;
+
+@Path("/C3756")
+public class C3756 {
+  private final S3756 s3756;
+
+  public C3756(S3756 s3756) {
+    super();
+    this.s3756 = s3756;
+  }
+
+  @GET
+  public String handle() {
+    s3756.accept("hello");
+    return "hello";
+  }
+}
diff --git a/tests/src/test/java/io/jooby/i3756/S3756.java b/tests/src/test/java/io/jooby/i3756/S3756.java
new file mode 100644
index 0000000000..2afbf013b5
--- /dev/null
+++ b/tests/src/test/java/io/jooby/i3756/S3756.java
@@ -0,0 +1,11 @@
+/*
+ * Jooby https://jooby.io
+ * Apache License Version 2.0 https://jooby.io/LICENSE.txt
+ * Copyright 2014 Edgar Espina
+ */
+package io.jooby.i3756;
+
+public interface S3756 {
+
+  void accept(String s);
+}