diff --git a/RichString.c b/RichString.c
index 5e63038f5..159d08ca0 100644
--- a/RichString.c
+++ b/RichString.c
@@ -65,7 +65,7 @@ static void RichString_setLen(RichString* this, int len) {
 }
 
 void RichString_rewind(RichString* this, int count) {
-   RichString_setLen(this, this->chlen - count);
+   RichString_setLen(this, this->chlen > count ? this->chlen - count : 0);
 }
 
 #ifdef HAVE_LIBNCURSESW