diff --git a/src/libsysprof/sysprof-symbol-resolver.c b/src/libsysprof/sysprof-symbol-resolver.c
index 19e4140d..3ba6166d 100644
--- a/src/libsysprof/sysprof-symbol-resolver.c
+++ b/src/libsysprof/sysprof-symbol-resolver.c
@@ -20,6 +20,8 @@
 
 #include "config.h"
 
+#include <unistd.h>
+
 #include "sysprof-platform.h"
 #include "sysprof-symbol-resolver.h"