diff --git a/src/libsysprof/sysprof-elf-loader.c b/src/libsysprof/sysprof-elf-loader.c
index c104b37b..2e52e26c 100644
--- a/src/libsysprof/sysprof-elf-loader.c
+++ b/src/libsysprof/sysprof-elf-loader.c
@@ -21,6 +21,7 @@
 #include "config.h"
 
 #include <fcntl.h>
+#include <unistd.h>
 #include <sys/stat.h>
 
 #include "sysprof-elf-private.h"