diff --git a/src/glsl/loop_analysis.h b/src/glsl/loop_analysis.h
index 295dc79..165214d 100644
--- a/src/glsl/loop_analysis.h
+++ b/src/glsl/loop_analysis.h
@@ -207,8 +207,7 @@ public:
       const bool is_const = (this->num_assignments == 0)
 	 || ((this->num_assignments == 1)
 	     && !this->conditional_or_nested_assignment
-	     && !this->read_before_write
-	     && this->rhs_clean);
+	     && !this->read_before_write);
 
       /* If the RHS of *the* assignment is clean, then there must be exactly
        * one assignment of the variable.