diff --git a/libs/gamecode/pr_exec.c b/libs/gamecode/pr_exec.c
index 03182e372..4ab985849 100644
--- a/libs/gamecode/pr_exec.c
+++ b/libs/gamecode/pr_exec.c
@@ -257,7 +257,7 @@ PR_LeaveFunction (progs_t *pr)
 VISIBLE void
 PR_BoundsCheckSize (progs_t *pr, pointer_t addr, unsigned size)
 {
-	if (addr < pr->pr_real_params[0] - pr->pr_globals)
+	if (addr < pr->pr_return - pr->pr_globals)
 		PR_RunError (pr, "null pointer access");
 	if (addr >= pr->globals_size
 		|| size > (unsigned) (pr->globals_size - addr))