diff --git a/src/string.c b/src/string.c
index 9737253..8e0ce2e 100644
--- a/src/string.c
+++ b/src/string.c
@@ -31,15 +31,12 @@ Str str_concat(Allocator *alloc, Str first, Str second)
 
 Str str_push(Allocator *alloc, Str str)
 {
-    U8 *mem = (U8 *)allocator_push(alloc, sizeof(Str) + str.len, alignof(Str));
-    Str *new_str = (Str *)mem;
-    new_str->len = str.len;
-    new_str->str = &mem[sizeof(Str)];
+    U8 *mem = (U8 *)allocator_push(alloc, str.len, 1);
     if (!str_is_empty(str)) {
-        MemCopy(new_str->str, str.str, str.len);
+        MemCopy(mem, str.str, str.len);
     }
 
-    return *new_str;
+    return str_create(mem, str.len);
 }
 
 static INLINE bool char_is_ascii_whitespace(U8 byte)
@@ -85,6 +82,7 @@ Str str_ascii_trim(Str str)
 
 S64 str_substr(Str haystack, Str to_find)
 {
+    return -1;
 }
 
 // split @str on any byte in @separators, place split strings in @vec