diff --git a/sys/arm/include/_types.h b/sys/arm/include/_types.h
index d323ea7d806d..b6279631c9e7 100644
--- a/sys/arm/include/_types.h
+++ b/sys/arm/include/_types.h
@@ -107,7 +107,7 @@ typedef	__uint32_t	__vm_size_t;
 
 typedef	unsigned int	___wchar_t;
 #define	__WCHAR_MIN	0		/* min value for a wchar_t */
-#define	__WCHAR_MAX	__INT_MAX	/* max for a wchar_t <= WINT_MAX */
+#define	__WCHAR_MAX	__UINT_MAX	/* max value for a wchar_t */
 
 /*
  * Unusual type definitions.
diff --git a/sys/arm64/include/_types.h b/sys/arm64/include/_types.h
index ddfe9450c289..8720ca883c5b 100644
--- a/sys/arm64/include/_types.h
+++ b/sys/arm64/include/_types.h
@@ -95,7 +95,7 @@ typedef	__uint64_t	__vm_size_t;
 typedef	unsigned int	___wchar_t;
 
 #define	__WCHAR_MIN	0		/* min value for a wchar_t */
-#define	__WCHAR_MAX	__INT_MAX	/* max for a wchar_t <= WINT_MAX */
+#define	__WCHAR_MAX	__UINT_MAX	/* max value for a wchar_t */
 
 /*
  * Unusual type definitions.