diff --git a/inc/thorvg.h b/inc/thorvg.h
index 24a9d5a5..1d95ee53 100644
--- a/inc/thorvg.h
+++ b/inc/thorvg.h
@@ -256,7 +256,7 @@ public:
      * @return Result::Success when succeed, Result::InvalidArguments otherwise.
      *
      */
-    Result composite(std::unique_ptr<Paint> target, CompositeMethod method) const noexcept;
+    Result composite(std::unique_ptr<Paint> target, CompositeMethod method) noexcept;
 
     /**
      * @brief Gets the bounding box of the paint object before any transformation.
diff --git a/src/lib/tvgPaint.cpp b/src/lib/tvgPaint.cpp
index 987ddaee..a32ca43f 100644
--- a/src/lib/tvgPaint.cpp
+++ b/src/lib/tvgPaint.cpp
@@ -295,7 +295,7 @@ Paint* Paint::duplicate() const noexcept
 }
 
 
-Result Paint::composite(std::unique_ptr<Paint> target, CompositeMethod method) const noexcept
+Result Paint::composite(std::unique_ptr<Paint> target, CompositeMethod method) noexcept
 {
     if (pImpl->composite(target.release(), method)) return Result::Success;
     return Result::InvalidArguments;