diff --git a/src/mesa/drivers/dri/radeon/radeon_span.c b/src/mesa/drivers/dri/radeon/radeon_span.c
index d603f52..a71968b 100644
--- a/src/mesa/drivers/dri/radeon/radeon_span.c
+++ b/src/mesa/drivers/dri/radeon/radeon_span.c
@@ -828,7 +828,7 @@ static void radeonSpanRenderStart(GLcontext * ctx)
 	}
 
 	for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
-		if (ctx->Texture.Unit[i]._ReallyEnabled)
+		if (ctx->Texture.Unit[i]._ReallyEnabled && ctx->Texture.Unit[i]._Current->Image[0][0]->TexFormat->MesaFormat != -1)
 			ctx->Driver.MapTexture(ctx, ctx->Texture.Unit[i]._Current);
 	}