--- a/misc/executable.cpp	Sat Jul 01 06:33:51 2017 +0200
+++ b/misc/executable.cpp	Sat Jul 01 07:08:34 2017 +0200
@@ -85,13 +85,14 @@
     result = path;
 #elif defined(__OpenBSD__)
     char **paths, path[PATH_MAX + 1] = {0};
-    int length, mib[] = { CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ARGV };
+    int mib[] = { CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ARGV };
+    size_t length = 0;
 
-    if (sysctl(mib, 4, nullptr, &length, nullptr, 0) < 0)
+    if (sysctl(mib, 4, 0, &length, 0, 0) < 0)
         throw std::runtime_error(std::strerror(errno));
-    if ((paths = static_cast<char**>(std::malloc(length))) == nullptr)
+    if (!(paths = static_cast<char**>(std::malloc(length))))
         throw std::runtime_error(std::strerror(errno));
-    if (sysctl(mib, 4, paths, &length, nullptr, 0) < 0) {
+    if (sysctl(mib, 4, paths, &length, 0, 0) < 0) {
         std::free(paths);
         throw std::runtime_error(std::strerror(errno));
     }
@@ -100,7 +101,6 @@
     result = path;
 
     std::free(paths);
-    std::free(path);
 #endif
 
     return result;