diff --git a/src/racket/src/schpriv.h b/src/racket/src/schpriv.h
index 111e31564a..de3f9e7758 100644
--- a/src/racket/src/schpriv.h
+++ b/src/racket/src/schpriv.h
@@ -2023,7 +2023,7 @@ Scheme_Object *scheme_load_delayed_code(int pos, struct Scheme_Load_Delay *ld);
 
 intptr_t scheme_get_print_width(void);
 
-#ifndef PTIdPTR
+#ifndef PRIdPTR
 # ifndef PRINTF_INTPTR_SIZE_PREFIX
 # define PRINTF_INTPTR_SIZE_PREFIX "l"
 # endif