diff --git a/plugins/GSdx/GSRendererOGL.cpp b/plugins/GSdx/GSRendererOGL.cpp
index 5b48f27adb..04691d14e1 100644
--- a/plugins/GSdx/GSRendererOGL.cpp
+++ b/plugins/GSdx/GSRendererOGL.cpp
@@ -537,7 +537,8 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
 			// In standard mode palette is only used when alpha channel of the RT is
 			// reinterpreted as an index. Star Ocean 3 uses it to emulate a stencil buffer.
 			// It is a very bad idea to force bilinear filtering on it.
-			bilinear &= !ps_sel.ifmt;
+			if (ps_sel.ifmt)
+				bilinear = m_vt.IsLinear();
 
 			//GL_INS("Use palette with format %d and index format %d", ps_sel.fmt, ps_sel.ifmt);
 		} else {