diff --git a/src/libutf8/500_encode_state.c b/src/libutf8/500_encode_state.c
index ff76eba..3fe4946 100644
--- a/src/libutf8/500_encode_state.c
+++ b/src/libutf8/500_encode_state.c
@@ -10,8 +10,7 @@
 struct utf8_encode_state*
 utf8_encoder(struct utf8_encode_state* state)
 {
-    char* wr = state->wr, * ret;
-    char* endp = wr + state->wr_size - 1;
+    char* wr, * ret, * endp;
     wchar_t ch;
     enum utf8_encode_error_action error_action;
     int reencoding;
@@ -21,6 +20,9 @@ utf8_encoder(struct utf8_encode_state* state)
         return 0;
     }
 
+    wr = state->wr;
+    endp = wr + state->wr_size - 1;
+
     state->written = 0;
     while(state->rd_remain) {
         ch = *state->rd;