diff --git a/dist/rts/idris_utf8.c b/dist/rts/idris_utf8.c
index a695ceb..ef0c346 100644
--- a/dist/rts/idris_utf8.c
+++ b/dist/rts/idris_utf8.c
@@ -105,7 +105,7 @@ char* idris_utf8_advance(char* str, int i) {
 
 int idris_utf8_findOffset(char* str, int i) {
     int offset = 0;
-    while(i > 0 && str != '\0') {
+    while(i > 0 && *str != '\0') {
         int len = idris_utf8_charlen(str);
         str+=len;
         offset+=len;