diff --git a/include/GafferCycles/CyclesLight.h b/include/GafferCycles/CyclesLight.h
index b565020..600d5a3 100644
--- a/include/GafferCycles/CyclesLight.h
+++ b/include/GafferCycles/CyclesLight.h
@@ -61,7 +61,7 @@ class GAFFERCYCLES_API CyclesLight : public GafferScene::Light
 	protected :
 
 		void hashLight( const Gaffer::Context *context, IECore::MurmurHash &h ) const override;
-#ifdef GAFFER_MAJOR_VERSION >= 56
+#ifdef GAFFER_MAJOR_VERSION > 55
 		IECoreScene::ConstShaderNetworkPtr computeLight( const Gaffer::Context *context ) const override;
 #else
 		IECoreScene::ShaderNetworkPtr computeLight( const Gaffer::Context *context ) const override;
diff --git a/src/GafferCycles/CyclesLight.cpp b/src/GafferCycles/CyclesLight.cpp
index b2f4599..3a19d9b 100644
--- a/src/GafferCycles/CyclesLight.cpp
+++ b/src/GafferCycles/CyclesLight.cpp
@@ -102,7 +102,7 @@ void CyclesLight::hashLight( const Gaffer::Context *context, IECore::MurmurHash
 	shaderNamePlug()->hash( h );
 }
 
-#ifdef GAFFER_MAJOR_VERSION >= 56
+#ifdef GAFFER_MAJOR_VERSION > 55
 IECoreScene::ConstShaderNetworkPtr CyclesLight::computeLight( const Gaffer::Context *context ) const
 #else
 IECoreScene::ShaderNetworkPtr CyclesLight::computeLight( const Gaffer::Context *context ) const