diff --git a/src/stdlib/builtin/lv_string_builtin.c b/src/stdlib/builtin/lv_string_builtin.c
index 62742a39f8..bc4551bbb8 100644
--- a/src/stdlib/builtin/lv_string_builtin.c
+++ b/src/stdlib/builtin/lv_string_builtin.c
@@ -229,12 +229,8 @@ char * lv_strdup(const char * src)
 
 char * lv_strcat(char * dst, const char * src)
 {
-    char * tmp = dst;
-    while(*dst != '\0') {
-        dst++;
-    }
-    lv_strcpy(dst, src);
-    return tmp;
+    lv_strcpy(dst + lv_strlen(dst), src);
+    return dst;
 }
 
 char * lv_strncat(char * dst, const char * src, size_t src_len)
diff --git a/src/stdlib/rtthread/lv_string_rtthread.c b/src/stdlib/rtthread/lv_string_rtthread.c
index 68ea8d9bc7..c2a12a1176 100644
--- a/src/stdlib/rtthread/lv_string_rtthread.c
+++ b/src/stdlib/rtthread/lv_string_rtthread.c
@@ -87,7 +87,10 @@ char * lv_strdup(const char * src)
 
 char * lv_strcat(char * dst, const char * src)
 {
-    return strcat(dst, src);
+    /*Since RT-thread does not have rt_strcat,
+    the following code is used instead.*/
+    lv_strcpy(dst + lv_strlen(dst), src);
+    return dst;
 }
 
 char * lv_strncat(char * dst, const char * src, size_t src_len)