diff --git a/src/evaluator/macros.rs b/src/evaluator/macros.rs
index 36d6532..9f48777 100644
--- a/src/evaluator/macros.rs
+++ b/src/evaluator/macros.rs
@@ -7,10 +7,12 @@ macro_rules! arg_count {
     };
 
     (modulo: $modulo:expr, $given:expr) => {
-        Err(Error::MismatchedArgCount(
-            ($given / $modulo) * $modulo + $modulo,
-            $given,
-        ))?
+        if $given % $modulo != 0 {
+            Err(Error::MismatchedArgCount(
+                ($given / $modulo) * $modulo + $modulo,
+                $given,
+            ))?
+        }
     };
 }
 
diff --git a/src/evaluator/mod.rs b/src/evaluator/mod.rs
index 3d05777..43dad4d 100644
--- a/src/evaluator/mod.rs
+++ b/src/evaluator/mod.rs
@@ -254,6 +254,7 @@ mod test {
     #[rstest]
     #[case("{:a}")]
     #[case("(not-a-func :uwu)")]
+    #[case("{:a}")]
     fn test_evaluator_fail(#[case] input: &str) {
         let env = core_environment();
         let tokens = lexer::read(input).unwrap();