diff --git a/libs/openFrameworks/gl/ofFbo.cpp b/libs/openFrameworks/gl/ofFbo.cpp
index 3c3d16d8810..32632850f86 100644
--- a/libs/openFrameworks/gl/ofFbo.cpp
+++ b/libs/openFrameworks/gl/ofFbo.cpp
@@ -302,6 +302,15 @@ ofFbo::ofFbo(const ofFbo & mom){
     }
 }
 
+//--------------------------------------------------------------
+void ofFbo::operator+=(const ofFbo & fbo){
+	if (fbo.isAllocated()) {
+		this->begin();
+		fbo.draw(0,0);
+		this->end();
+	}
+}
+
 //--------------------------------------------------------------
 ofFbo & ofFbo::operator=(const ofFbo & mom){
 	if(&mom==this) return *this;
diff --git a/libs/openFrameworks/gl/ofFbo.h b/libs/openFrameworks/gl/ofFbo.h
index 2ec3ad43781..7fab6294edf 100644
--- a/libs/openFrameworks/gl/ofFbo.h
+++ b/libs/openFrameworks/gl/ofFbo.h
@@ -48,6 +48,7 @@ class ofFbo : public ofBaseDraws, public ofBaseHasTexture {
 	ofFbo();
 	ofFbo(const ofFbo & mom);
 	ofFbo & operator=(const ofFbo & fbo);
+	void operator+=(const ofFbo & fbo);
     ofFbo(ofFbo && mom);
     ofFbo & operator=(ofFbo && fbo);
 	virtual ~ofFbo();