diff --git a/io.c b/io.c
index f8b93c65b5e..09e50dc74e7 100644
--- a/io.c
+++ b/io.c
@@ -61,10 +61,10 @@
 #endif
 
 #include <sys/types.h>
-#if defined(HAVE_SYS_IOCTL_H) && !defined(_WIN32)
+#ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
 #endif
-#if defined(HAVE_FCNTL_H) || defined(_WIN32)
+#if defined(HAVE_FCNTL_H)
 #include <fcntl.h>
 #elif defined(HAVE_SYS_FCNTL_H)
 #include <sys/fcntl.h>
@@ -7531,7 +7531,6 @@ rb_pipe(int *pipes)
 }
 
 #ifdef _WIN32
-#define HAVE_SPAWNV 1
 #define spawnv(mode, cmd, args) rb_w32_uaspawn((mode), (cmd), (args))
 #define spawn(mode, cmd) rb_w32_uspawn((mode), (cmd), 0)
 #endif
diff --git a/process.c b/process.c
index b4f9c2bced0..03e20d2e2cf 100644
--- a/process.c
+++ b/process.c
@@ -125,7 +125,7 @@ int initgroups(const char *, rb_gid_t);
 #define open	rb_w32_uopen
 #endif
 
-#if defined(HAVE_TIMES) || defined(_WIN32)
+#if defined(HAVE_TIMES)
 /*********************************************************************
  *
  * Document-class: Process::Tms
@@ -9566,7 +9566,7 @@ InitVM_process(void)
     rb_define_module_function(rb_mProcess, "clock_gettime", rb_clock_gettime, -1);
     rb_define_module_function(rb_mProcess, "clock_getres", rb_clock_getres, -1);
 
-#if defined(HAVE_TIMES) || defined(_WIN32)
+#if defined(HAVE_TIMES)
     rb_cProcessTms = rb_struct_define_under(rb_mProcess, "Tms", "utime", "stime", "cutime", "cstime", NULL);
 #if 0 /* for RDoc */
     /* user time used in this process */