diff --git a/src/internal/ksigaction.h b/src/internal/ksigaction.h
index 8bdfd1d8..57f47b3f 100644
--- a/src/internal/ksigaction.h
+++ b/src/internal/ksigaction.h
@@ -2,5 +2,5 @@ struct k_sigaction {
 	void (*handler)(int);
 	unsigned long flags;
 	void (*restorer)(void);
-	long mask[2];
+	unsigned long mask[2];
 };