diff --git a/libc/bionic/sigaddset.cpp b/libc/bionic/sigaddset.cpp
index 6ade3b1..ca6b982 100644
--- a/libc/bionic/sigaddset.cpp
+++ b/libc/bionic/sigaddset.cpp
@@ -31,8 +31,8 @@
 
 int sigaddset(sigset_t* set, int signum) {
   int bit = signum - 1; // Signal numbers start at 1, but bit positions start at 0.
-  unsigned long* local_set = (unsigned long*) set;
-  if (set == NULL || bit < 0 || bit >= (int) (8*sizeof(sigset_t))) {
+  unsigned long* local_set = reinterpret_cast<unsigned long*>(set);
+  if (set == NULL || bit < 0 || bit >= static_cast<int>(8*sizeof(sigset_t))) {
     errno = EINVAL;
     return -1;
   }