diff --git a/src/normal.cc b/src/normal.cc
index a5f75269..5729eee2 100644
--- a/src/normal.cc
+++ b/src/normal.cc
@@ -18,6 +18,7 @@
 #include "window.hh"
 
 #include <signal.h>
+#include <unistd.h>
 
 namespace Kakoune
 {
diff --git a/src/shell_manager.cc b/src/shell_manager.cc
index e105f102..af2aa98d 100644
--- a/src/shell_manager.cc
+++ b/src/shell_manager.cc
@@ -6,6 +6,7 @@
 #include <cstring>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <unistd.h>
 
 namespace Kakoune
 {