diff --git a/winsup/cygwin/flock.cc b/winsup/cygwin/flock.cc
index 860791d7b..74374d727 100644
--- a/winsup/cygwin/flock.cc
+++ b/winsup/cygwin/flock.cc
@@ -1736,7 +1736,7 @@ lf_split (lockf_t *lock1, lockf_t *lock2, lockf_t **split)
   splitlock = *split;
   assert (splitlock != NULL);
   *split = splitlock->lf_next;
-  memcpy (splitlock, lock1, sizeof *splitlock);
+  memcpy ((void *) splitlock, lock1, sizeof *splitlock);
   /* We have to unset the obj HANDLE here which has been copied by the
      above memcpy, so that the calling function recognizes the new object.
      See post-lf_split handling in lf_setlock and lf_clearlock. */
diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index 158f1e5fb..8da858da1 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -1299,7 +1299,7 @@ path_conv::serialize (HANDLE h, unsigned int &n) const
       n = 0;
       return NULL;
     }
-  memcpy (&pcf->pc, this, sizeof *this);
+  memcpy ((void *) &pcf->pc, this, sizeof *this);
   pcf->hdl = h;
   pcf->name_len = nlen;
   pcf->posix_len = plen;
@@ -1318,7 +1318,7 @@ path_conv::deserialize (void *bufp)
   char *p;
   HANDLE ret;
 
-  memcpy (this, &pcf->pc, sizeof *this);
+  memcpy ((void *) this, &pcf->pc, sizeof *this);
   wide_path = uni_path.Buffer = NULL;
   uni_path.MaximumLength = uni_path.Length = 0;
   path = posix_path = NULL;
diff --git a/winsup/cygwin/path.h b/winsup/cygwin/path.h
index 0c94c6152..69af5a01c 100644
--- a/winsup/cygwin/path.h
+++ b/winsup/cygwin/path.h
@@ -313,7 +313,7 @@ class path_conv
   path_conv& eq_worker (const path_conv& pc, const char *in_path)
   {
     free_strings ();
-    memcpy (this, &pc, sizeof pc);
+    memcpy ((void *) this, &pc, sizeof pc);
     /* The device info might contain pointers to allocated strings, in
        contrast to statically allocated strings.  Calling device::dup()
        will duplicate the string if the source was allocated. */
diff --git a/winsup/cygwin/pinfo.cc b/winsup/cygwin/pinfo.cc
index d002268ed..cdbd8bd7e 100644
--- a/winsup/cygwin/pinfo.cc
+++ b/winsup/cygwin/pinfo.cc
@@ -1418,12 +1418,12 @@ winpids::add (DWORD& nelem, bool winpid, DWORD pid)
     {
       npidlist += slop_pidlist;
       pidlist = (DWORD *) realloc (pidlist, size_pidlist (npidlist + 1));
-      pinfolist = (pinfo *) realloc (pinfolist, size_pinfolist (npidlist + 1));
+      pinfolist = (pinfo *) realloc ((void *) pinfolist, size_pinfolist (npidlist + 1));
     }
 
   _onreturn onreturn;
   pinfo& p = pinfolist[nelem];
-  memset (&p, 0, sizeof (p));
+  memset ((void *) &p, 0, sizeof (p));
 
   bool perform_copy;
   if (cygpid == myself->pid)