diff --git a/builtin/assert.mbt b/builtin/assert.mbt
index ddc071b4e..a9d098147 100644
--- a/builtin/assert.mbt
+++ b/builtin/assert.mbt
@@ -48,7 +48,7 @@ fn debug_string[T : Show](t : T) -> String {
 /// ```
 pub fn assert_eq[T : Eq + Show](a : T, b : T, loc~ : SourceLoc = _) -> Unit! {
   if a != b {
-    fail!("`\{a} == \{b}`",loc~)
+    fail!("`\{a} == \{b}`", loc~)
   }
 }
 
@@ -86,7 +86,7 @@ pub fn assert_not_eq[T : Eq + Show](
   if not(a != b) {
     let a = debug_string(a)
     let b = debug_string(b)
-    fail!("`\{a} != \{b}`",loc~)
+    fail!("`\{a} != \{b}`", loc~)
   }
 }
 
@@ -116,7 +116,7 @@ pub fn assert_not_eq[T : Eq + Show](
 /// ```
 pub fn assert_true(x : Bool, loc~ : SourceLoc = _) -> Unit! {
   if not(x) {
-    fail!("`\{x}` is not true",loc~)
+    fail!("`\{x}` is not true", loc~)
   }
 }
 
@@ -148,6 +148,6 @@ pub fn assert_true(x : Bool, loc~ : SourceLoc = _) -> Unit! {
 pub fn assert_false(x : Bool, loc~ : SourceLoc = _) -> Unit! {
   if x {
     let x = debug_string(x)
-    fail!("`\{x}` is not false",loc~)
+    fail!("`\{x}` is not false", loc~)
   }
 }