1 files changed, 3 insertions, 1 deletions

diff --git a/lib/libc/stdio/vfwprintf.c b/lib/libc/stdio/vfwprintf.c
index eabdc9ec8dc7..f184b4c209f4 100644
--- a/lib/libc/stdio/vfwprintf.c
+++ b/lib/libc/stdio/vfwprintf.c
@@ -380,8 +380,10 @@ __mbsconv(char *mbsarg, int prec)
 		}
 		if (nconv == (size_t)-1 || nconv == (size_t)-2)
 			return (NULL);
-	} else
+	} else {
 		insize = strlen(mbsarg);
+		nconv = 0;
+	}
 
 	/*
 	 * Allocate buffer for the result and perform the conversion,