diff --git a/code/nel/src/3d/driver/OpenGL3/driver_glsl_shader_generator.cpp b/code/nel/src/3d/driver/OpenGL3/driver_glsl_shader_generator.cpp
index 1f40a01ab..76b433acd 100644
--- a/code/nel/src/3d/driver/OpenGL3/driver_glsl_shader_generator.cpp
+++ b/code/nel/src/3d/driver/OpenGL3/driver_glsl_shader_generator.cpp
@@ -853,6 +853,9 @@ namespace NL3D
 
 	void CGLSLShaderGenerator::generateLightMapPS()
 	{
+		int ls = material->_LightMaps.size();
+		ls++; // lightmaps + color texture
+
 		int ntextures = 0;
 		for( int i = TexCoord0; i < TexCoord4; i++ )
 		{
@@ -860,6 +863,8 @@ namespace NL3D
 				ntextures++;
 		}
 
+		ntextures = std::max( ntextures, ls );
+
 		for( int i = 0; i < ntextures; i++ )
 			ss << "uniform sampler2D sampler" << i << ";" << std::endl;
 
diff --git a/code/nel/src/3d/driver/OpenGL3/driver_opengl_program.cpp b/code/nel/src/3d/driver/OpenGL3/driver_opengl_program.cpp
index e6a3f1df4..8910b0f04 100644
--- a/code/nel/src/3d/driver/OpenGL3/driver_opengl_program.cpp
+++ b/code/nel/src/3d/driver/OpenGL3/driver_opengl_program.cpp
@@ -156,6 +156,9 @@ namespace NL3D
 		desc.setShaderType( mat.getShader() );
 		desc.setVBFlags( _CurrentVertexBufferHard->VB->getVertexFormat() );
 		
+		if( mat.getShader() == CMaterial::LightMap )
+			desc.setNLightMaps( mat._LightMaps.size() );
+		
 		int i = 0;
 
 		if( mat.getShader() == CMaterial::Normal )
diff --git a/code/nel/src/3d/driver/OpenGL3/driver_opengl_shader_desc.h b/code/nel/src/3d/driver/OpenGL3/driver_opengl_shader_desc.h
index ced7d724b..4f5a6a594 100644
--- a/code/nel/src/3d/driver/OpenGL3/driver_opengl_shader_desc.h
+++ b/code/nel/src/3d/driver/OpenGL3/driver_opengl_shader_desc.h
@@ -34,6 +34,7 @@ namespace NL3D
 			shaderType = 0;
 			program = NULL;
 			vbFlags = 0;
+			nlightmaps = 0;
 		}
 
 		~CShaderDesc(){
@@ -47,6 +48,9 @@ namespace NL3D
 			if( vbFlags != o.vbFlags )
 				return false;
 
+			if( nlightmaps != o.nlightmaps )
+				return false;
+
 			for( int i = 0; i < MAX_TEXTURES; i++ )
 				if( texEnvMode[ i ] != o.texEnvMode[ i ] )
 					return false;
@@ -58,12 +62,14 @@ namespace NL3D
 		void setVBFlags( uint32 flags ){ vbFlags = flags; }
 		void setShaderType( uint32 type ){ shaderType = type; }
 		void setProgram( IProgramObject *p ){ program = p; }
+		void setNLightMaps( uint32 n ){ nlightmaps = n; }
 		IProgramObject* getProgram() const{ return program; }
 
 	private:
 		uint32 texEnvMode[ MAX_TEXTURES ];
 		uint32 vbFlags;
 		uint32 shaderType;
+		uint32 nlightmaps;
 		IProgramObject *program;
 	};
 }