diff --git a/prospect/support/dsl.rkt b/prospect/support/dsl.rkt
index 4096aed..363d33f 100644
--- a/prospect/support/dsl.rkt
+++ b/prospect/support/dsl.rkt
@@ -3,7 +3,7 @@
 (require (for-syntax racket/base))
 (provide define&provide-dsl-helper-syntaxes)
 
-(define (illegal-use id context stx)
+(define-for-syntax (illegal-use id context stx)
   (raise-syntax-error #f (format "Illegal use of ~a outside ~a" id context) stx))
 
 (define-syntax-rule (define&provide-dsl-helper-syntaxes context (identifier ...))