diff --git a/plugins/GSdx/GSRendererOGL.cpp b/plugins/GSdx/GSRendererOGL.cpp
index 0cffc776cc..647c4a3829 100644
--- a/plugins/GSdx/GSRendererOGL.cpp
+++ b/plugins/GSdx/GSRendererOGL.cpp
@@ -518,7 +518,8 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
 			bilinear = false;
 
 			ps_sel.fmt = cpsm.fmt | 4;
-			ps_sel.ifmt = (context->TEX0.PSM == 0x1B) ? 3
+			ps_sel.ifmt = !tex->m_alpha_palette ? 0
+				: (context->TEX0.PSM == 0x1B) ? 3
 				: (context->TEX0.PSM == 0x24) ? 2
 				: (context->TEX0.PSM == 0x2C) ? 1
 				: 0;
diff --git a/plugins/GSdx/GSTextureCache.cpp b/plugins/GSdx/GSTextureCache.cpp
index 894ea44c98..0aa827af5f 100644
--- a/plugins/GSdx/GSTextureCache.cpp
+++ b/plugins/GSdx/GSTextureCache.cpp
@@ -756,6 +756,7 @@ GSTextureCache::Source* GSTextureCache::CreateSource(const GIFRegTEX0& TEX0, con
 		bool linear = true;
 		if (psm.pal > 0) {
 			src->m_palette = m_renderer->m_dev->CreateTexture(256, 1);
+			src->m_alpha_palette = true;
 			// Palette is used to interpret the alpha channel of the RT 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.
@@ -906,6 +907,7 @@ void GSTextureCache::Surface::Update()
 GSTextureCache::Source::Source(GSRenderer* r, const GIFRegTEX0& TEX0, const GIFRegTEXA& TEXA, uint8* temp)
 	: Surface(r, temp)
 	, m_palette(NULL)
+	, m_alpha_palette(false)
 	, m_initpalette(true)
 	, m_target(false)
 	, m_complete(false)
diff --git a/plugins/GSdx/GSTextureCache.h b/plugins/GSdx/GSTextureCache.h
index a4292acfc5..4bd5fbe629 100644
--- a/plugins/GSdx/GSTextureCache.h
+++ b/plugins/GSdx/GSTextureCache.h
@@ -57,6 +57,7 @@ public:
 
 	public:
 		GSTexture* m_palette;
+		bool m_alpha_palette; // in opengl palette value is either in red or alpha channel
 		bool m_initpalette;
 		uint32 m_valid[MAX_PAGES]; // each uint32 bits map to the 32 blocks of that page
 		uint32* m_clut;