diff --git a/tools/perf/lib/include/internal/lib.h b/tools/perf/lib/include/internal/lib.h
index 9168b7d2a7e1..5175d491b2d4 100644
--- a/tools/perf/lib/include/internal/lib.h
+++ b/tools/perf/lib/include/internal/lib.h
@@ -2,7 +2,7 @@
 #ifndef __LIBPERF_INTERNAL_LIB_H
 #define __LIBPERF_INTERNAL_LIB_H
 
-#include <unistd.h>
+#include <sys/types.h>
 
 extern unsigned int page_size;
 
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 12671d089748..a35dc57d5995 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -12,6 +12,7 @@
 #include <linux/zalloc.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h> // sysconf()
 #ifdef HAVE_LIBNUMA_SUPPORT
 #include <numaif.h>
 #endif