diff --git a/common/stringop.c b/common/stringop.c
index c503143ae..b497caec2 100644
--- a/common/stringop.c
+++ b/common/stringop.c
@@ -1,6 +1,5 @@
 #define _POSIX_C_SOURCE 200809L
 #include <ctype.h>
-#include <stdarg.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/include/stringop.h b/include/stringop.h
index 19a50f237..89a0f12f5 100644
--- a/include/stringop.h
+++ b/include/stringop.h
@@ -1,6 +1,7 @@
 #ifndef _SWAY_STRINGOP_H
 #define _SWAY_STRINGOP_H
 
+#include <stdarg.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include "list.h"