diff --git a/src/bin/pumpkin.rs b/src/bin/pumpkin.rs
index 0340476..996f0d9 100644
--- a/src/bin/pumpkin.rs
+++ b/src/bin/pumpkin.rs
@@ -142,7 +142,7 @@ struct BorrowedShaderVars <'a> {
 
 fn get_shader_attrs (
 	shader: &ShaderProgram,
-	attr_names: &Vec <(usize, &str)>
+	attr_names: &[(usize, &str)]
 ) 
 -> renderable_model::AttrMap
 {
@@ -150,8 +150,8 @@ fn get_shader_attrs (
 	
 	let attrs = shader.get_attribute_locations (attr_names.iter ().map (|(_, v)| v).copied ());
 	
-	for ((i, _), loc) in attr_names.iter ().zip (attrs.iter ()) {
-		v [*i] = *loc;
+	for ((i, _), loc) in attr_names.iter ().zip (attrs.into_iter ()) {
+		v [*i] = loc;
 	}
 	
 	v
@@ -159,23 +159,26 @@ fn get_shader_attrs (
 
 fn get_shader_uniforms (
 	shader: &ShaderProgram,
-	uni_names: &Vec <(u32, &str)>
+	uni_names: &[(u32, &str)]
 )
 -> HashMap <u32, i32>
 {
 	let unis = shader.get_uniform_locations (uni_names.iter ().map (|(_, v)| v).copied ());
 	
-	HashMap::from_iter (
-		uni_names.iter ()
-		.map (|(key, name)| (*key, *unis.get (*name).unwrap ()))
-	)
+	let pairs = 
+	uni_names.iter ().map (|(i, _)| i).copied ()
+	.zip (unis.into_iter ())
+	.filter (|(_, v)| *v >= 0)
+	;
+	
+	HashMap::from_iter (pairs)
 }
 
 impl ShaderClosure {
 	pub fn new (
 		program: ShaderProgram, 
-		uniform_names: &Vec <(u32, &str)>,
-		attr_names: &Vec <(usize, &str)>
+		uniform_names: &[(u32, &str)],
+		attr_names: &[(usize, &str)]
 	) -> Self
 	{
 		let uniforms = get_shader_uniforms (&program, uniform_names);
@@ -244,13 +247,13 @@ fn main () {
 	let uniform_names = {
 		use uniforms::*;
 		vec! [
-			(MVP, "mvp"),
-			(OBJECT_SPACE_LIGHT, "object_space_light"),
-			(OBJECT_SPACE_SKY, "object_space_sky"),
-			(ALBEDO, "albedo"),
-			(MIN_ALBEDO, "min_albedo"),
-			(MIN_BRIGHT, "min_bright"),
-			(TEXTURE, "texture"),
+			(MVP, "uni_mvp"),
+			(OBJECT_SPACE_LIGHT, "uni_object_space_light"),
+			(OBJECT_SPACE_SKY, "uni_object_space_sky"),
+			(ALBEDO, "uni_albedo"),
+			(MIN_ALBEDO, "uni_min_albedo"),
+			(MIN_BRIGHT, "uni_min_bright"),
+			(TEXTURE, "uni_texture"),
 		]
 	};
 	
diff --git a/src/shader.rs b/src/shader.rs
index b4f485d..a90ea2c 100644
--- a/src/shader.rs
+++ b/src/shader.rs
@@ -136,22 +136,19 @@ impl ShaderProgram {
 	}
 	
 	pub fn get_uniform_locations <'a, I> (&self, names: I)
-	-> HashMap <String, i32>
+	-> Vec <i32>
 	where I: Iterator <Item = &'a str>
 	{
 		self.use_program ();
 		
 		names
 		.map (|name| {
-			let mut s = String::from ("uni_");
-			s.push_str (name);
-			
-			let c_str = CString::new (s.as_bytes ()).unwrap ();
+			let c_str = CString::new (name.as_bytes ()).unwrap ();
 			let loc = unsafe {
 				gl::GetUniformLocation (self.id, c_str.as_ptr ())
 			};
 			
-			(String::from (name), loc)
+			loc
 		})
 		.collect ()
 	}