diff --git a/syscall.c b/syscall.c
index d9f7b3b7..9d025741 100644
--- a/syscall.c
+++ b/syscall.c
@@ -741,7 +741,7 @@ printcall(struct tcb *tcp)
 	tprintf("[%16lx] ", psw);
 # endif
 #elif defined(X86_64) || defined(X32)
-	tprintf("[%16lx] ", x86_64_regs.rip);
+	tprintf("[%16lx] ", (unsigned long) x86_64_regs.rip);
 #elif defined(IA64)
 	long ip;