diff --git a/lib/libc/stdio/vfprintf.c b/lib/libc/stdio/vfprintf.c
index df4bac29cb1..58e7a1f9610 100644
--- a/lib/libc/stdio/vfprintf.c
+++ b/lib/libc/stdio/vfprintf.c
@@ -1546,7 +1546,7 @@ done:
 			(*argtable) [n].sizearg = va_arg (ap, size_t);
 			break;
 		    case TP_SIZET:
-			(*argtable) [n].psizearg = va_arg (ap, ssize_t *);
+			(*argtable) [n].psizearg = va_arg (ap, size_t *);
 			break;
 		    case T_INTMAXT:
 			(*argtable) [n].intmaxarg = va_arg (ap, intmax_t);
diff --git a/lib/libc/stdio/vfwprintf.c b/lib/libc/stdio/vfwprintf.c
index 375d20226fe..78652776464 100644
--- a/lib/libc/stdio/vfwprintf.c
+++ b/lib/libc/stdio/vfwprintf.c
@@ -1538,7 +1538,7 @@ done:
 			(*argtable) [n].sizearg = va_arg (ap, size_t);
 			break;
 		    case TP_SIZET:
-			(*argtable) [n].psizearg = va_arg (ap, ssize_t *);
+			(*argtable) [n].psizearg = va_arg (ap, size_t *);
 			break;
 		    case T_INTMAXT:
 			(*argtable) [n].intmaxarg = va_arg (ap, intmax_t);