diff --git a/r1cs-std/src/test_constraint_system.rs b/r1cs-std/src/test_constraint_system.rs
index 4a934f8..f20a21c 100644
--- a/r1cs-std/src/test_constraint_system.rs
+++ b/r1cs-std/src/test_constraint_system.rs
@@ -132,10 +132,10 @@ impl<ConstraintF: Field> TestConstraintSystem<ConstraintF> {
 
 fn compute_path(ns: &[String], this: String) -> String {
     if this.chars().any(|a| a == '/') {
-        panic!(format!(
-            "'/' is not allowed in namespace names. Error in namespace name: {:?}",
+        panic!(
+            "'/' is not allowed in namespaces. Error in namespace '{}'",
             this
-        ));
+        );
     }
 
     let mut name = String::new();