diff --git a/src/GPUFontAtlasLayerCombo.cpp b/src/GPUFontAtlasLayerCombo.cpp
index de91a0c..b31fb8f 100644
--- a/src/GPUFontAtlasLayerCombo.cpp
+++ b/src/GPUFontAtlasLayerCombo.cpp
@@ -27,8 +27,10 @@ void GPUFontAtlasLayerCombo::setup(const ComboIdentifier & identifier,
     if(this->settings.bufferTargetType == GL_TEXTURE_2D_ARRAY){
         fontShader = shaderCatalog->get("font_ta");
     }else if(this->settings.bufferTargetType == GL_UNIFORM_BUFFER){
+        shaderCatalog->setReplacement("{{CURVES_BUFFER_SIZE}}", "2048");
         fontShader = shaderCatalog->get("font_ub");
     }
+    fontShaderProgram = fontShader->program;
 
     {
         FT_Error error = FT_Init_FreeType(&library);
@@ -40,6 +42,7 @@ void GPUFontAtlasLayerCombo::setup(const ComboIdentifier & identifier,
     ofxGPUFont::initializeFont(library,
                                this->identifier.fontPath,
                                font,
+                               fontShaderProgram,
                                this->settings.bufferTargetType);
 
     font->listFontVariationAxes(fontVariationAxesParameters, library);
@@ -97,6 +100,8 @@ void GPUFontAtlasLayerCombo::update(){
         variationText = std::move(_variationText);
         font->prepareGlyphsForText(variationText,
                                    library,
+                                   shaderCatalog,
+                                   fontShader,
                                    true);
         isDirty = false;
     }