diff --git a/lib/libc/sparc64/sys/__sparc_sigtramp_setup.c b/lib/libc/sparc64/sys/__sparc_sigtramp_setup.c
index 63fcb82eb41..4475c6d4632 100644
--- a/lib/libc/sparc64/sys/__sparc_sigtramp_setup.c
+++ b/lib/libc/sparc64/sys/__sparc_sigtramp_setup.c
@@ -42,5 +42,5 @@ void
 __sparc_sigtramp_setup(void)
 {
 
-	sysarch(SPARC_SIGTRAMP_INSTALL, &sia);
+	sysarch(SPARC_SIGTRAMP_INSTALL, (void *)&sia);
 }