diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
@@ -47,7 +47,7 @@
 #if SANITIZER_SOLARIS
 // Illumos' declaration of madvie cannot be made visible if _XOPEN_SOURCE
 // is defined as g++ does on Solaris.
-extern "C" int madvise(caddr_t, size_t, int);
+extern "C" int madvise(void *, size_t, int);
 #endif
 
 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);