diff --git a/SecureUDID.m b/SecureUDID.m
index bddf987..690501d 100644
--- a/SecureUDID.m
+++ b/SecureUDID.m
@@ -209,7 +209,7 @@ void removeAllSecureUDIDData(void) {
     NSMutableDictionary* mostRecentDictionary;
     
     usablePasteboard     = nil;
-    lowestUnusedIndex    = INTMAX_MAX;
+    lowestUnusedIndex    = -1;
     mostRecentDate       = [NSDate distantPast];
     mostRecentDictionary = nil;