diff --git a/exercises/02_basic_calculator/04_panics/src/lib.rs b/exercises/02_basic_calculator/04_panics/src/lib.rs
index f70452fa18..b61b2cf645 100644
--- a/exercises/02_basic_calculator/04_panics/src/lib.rs
+++ b/exercises/02_basic_calculator/04_panics/src/lib.rs
@@ -3,7 +3,7 @@
 fn speed(start: u32, end: u32, time_elapsed: u32) -> u32 {
     // TODO: Panic with a custom message if `time_elapsed` is 0
     if time_elapsed == 0 {
-        panic!("The journey took no time at all, that's impossible!");
+        panic!("The journey took no time at all. That's impossible!");
     }
 
     (end - start) / time_elapsed