diff --git a/renderdoc/driver/gl/gl_shader_refl.cpp b/renderdoc/driver/gl/gl_shader_refl.cpp
index 1cba2f5c0..6b9ae7f7a 100644
--- a/renderdoc/driver/gl/gl_shader_refl.cpp
+++ b/renderdoc/driver/gl/gl_shader_refl.cpp
@@ -610,7 +610,7 @@ void MakeShaderReflection(const GLHookSet &gl, GLenum shadType, GLuint sepProg,
 
 		if(values[5] == -1 && values[2] >= 0)
 		{
-			var.reg.vec = values[3];
+			var.reg.vec = values[2];
 			var.reg.comp = 0;
 		}
 		else if(values[5] >= 0)